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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2013	Oct. 31, 2013
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	ANSS
Entity Registrant Name	ANSYS INC
Entity Central Index Key	0001013462
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		92,659,798

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 707,334	$ 576,703
Short-term investments	440	452
Accounts receivable, less allowance for doubtful accounts of $5,400 and $4,800, respectively	79,912	96,598
Other receivables and current assets	148,652	216,268
Deferred income taxes	23,618	23,338
Total current assets	959,956	913,359
Property and equipment, net	54,952	52,253
Construction in progress leased facility	11,222	0
Goodwill	1,255,275	1,251,247
Other intangible assets, net	305,833	351,173
Other long-term assets	13,206	24,393
Deferred income taxes	17,835	14,992
Total assets	2,618,279	2,607,417
Current liabilities:
Current portion of long-term debt	0	53,149
Accounts payable	3,349	4,924
Accrued bonuses and commissions	30,922	42,601
Accrued income taxes	7,444	8,182
Deferred income taxes	99	1,409
Other accrued expenses and liabilities	60,102	61,329
Deferred revenue	285,040	305,793
Total current liabilities	386,956	477,387
Long-term liabilities:
Non-cash obligation for construction in progress leased facility	11,222	0
Deferred income taxes	71,115	92,822
Other long-term liabilities	60,688	96,917
Total long-term liabilities	143,025	189,739
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.01 par value; 2,000,000 shares authorized; zero shares issued or outstanding	0	0
Common stock, $.01 par value; 300,000,000 shares authorized; 93,236,023 and 93,201,905 shares issued, respectively	932	932
Additional paid-in capital	921,780	927,368
Retained earnings	1,208,889	1,039,491
Treasury stock, at cost: 584,195 and 536,231 shares, respectively	(43,129)	(36,151)
Accumulated other comprehensive (loss) income	(174)	8,651
Total stockholders' equity	2,088,298	1,940,291
Total liabilities and stockholders' equity	$ 2,618,279	$ 2,607,417

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts	$ 5,400	$ 4,800
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	93,236,023	93,201,905
Treasury stock, shares	584,195	536,231

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:
Software licenses	$ 129,185	$ 123,027	$ 381,177	$ 359,933
Maintenance and service	83,473	73,882	244,063	217,337
Total revenue	212,658	196,909	625,240	577,270
Cost of sales:
Software licenses	6,244	5,473	19,978	17,758
Amortization	9,215	10,244	29,073	30,583
Maintenance and service	19,710	18,039	59,032	54,494
Total cost of sales	35,169	33,756	108,083	102,835
Gross profit	177,489	163,153	517,157	474,435
Operating expenses:
Selling, general and administrative	51,345	49,195	156,620	143,424
Research and development	38,882	33,506	113,559	98,422
Amortization	5,625	6,800	17,367	19,975
Total operating expenses	95,852	89,501	287,546	261,821
Operating income	81,637	73,652	229,611	212,614
Interest expense	(226)	(632)	(967)	(2,173)
Interest income	656	774	2,131	2,562
Other expense, net	(357)	(355)	(851)	(1,010)
Income before income tax provision	81,710	73,439	229,924	211,993
Income tax provision	19,280	21,820	60,526	64,573
Net income	$ 62,430	$ 51,619	$ 169,398	$ 147,420
Earnings per share - basic:
Basic earnings per share	$ 0.67	$ 0.56	$ 1.83	$ 1.59
Weighted average shares - basic	92,541	92,448	92,770	92,631
Earnings per share - diluted:
Diluted earnings per share	$ 0.66	$ 0.54	$ 1.78	$ 1.55
Weighted average shares - diluted	95,265	94,755	95,157	94,958

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 62,430	$ 51,619	$ 169,398	$ 147,420
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	5,477	7,049	(8,825)	2,497
Comprehensive income	$ 67,907	$ 58,668	$ 160,573	$ 149,917

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 169,398	$ 147,420
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	61,263	63,669
Deferred income tax benefit	(18,184)	(12,679)
Provision for bad debts	1,129	170
Stock-based compensation expense	26,742	23,930
Excess tax benefits from stock options	(8,739)	(7,901)
Other	49	5
Changes in operating assets and liabilities:
Accounts receivable	15,182	10,584
Other receivables and current assets	23,363	(6,394)
Other long-term assets	193	(11,336)
Accounts payable, accrued expenses and current liabilities	(14,971)	(9,794)
Accrued income taxes	8,860	8,521
Deferred revenue	1,673	13,033
Other long-term liabilities	(17,936)	9,599
Net cash provided by operating activities	248,022	228,827
Cash flows from investing activities:
Payments to Acquire Businesses, Net of Cash Acquired	(4,224)	(46,395)
Capital expenditures	(14,147)	(17,882)
Purchases of short-term investments	(147)	(181)
Maturities of short-term investments	97	293
Net cash used in investing activities	(18,421)	(64,165)
Cash flows from financing activities:
Principal payments on long-term debt	(53,149)	(47,834)
Principal payments on capital leases	0	(14)
Payments for Repurchase of Common Stock	(73,457)	(61,591)
Payments Related to Tax Withholding for Share-based Compensation	(4,269)	0
Payments of Merger Related Costs, Financing Activities	(3,174)	(3,241)
Proceeds from issuance of common stock under Employee Stock Purchase Plan	2,987	2,446
Proceeds from exercise of stock options	26,633	19,249
Excess tax benefits from stock options	8,739	7,901
Net cash used in financing activities	(95,690)	(83,084)
Effect of exchange rate fluctuations on cash and cash equivalents	(3,280)	1,481
Net increase in cash and cash equivalents	130,631	83,059
Cash and cash equivalents, beginning of period	576,703	471,828
Cash and cash equivalents, end of period	707,334	554,887
Supplemental disclosures of cash flow information:
Income taxes paid	72,160	78,983
Interest paid	735	1,735
Construction In Progress Leased Facility Supplemental Cash Flow	$ 11,222	$ 0

Organization

9 Months Ended

Sep. 30, 2013

Organization

ANSYS, Inc. (hereafter the "Company" or "ANSYS") develops and globally markets engineering simulation software and technologies widely used by engineers, designers, researchers and students across a broad spectrum of industries and academia, including aerospace, automotive, manufacturing, electronics, biomedical, energy and defense.

As defined by the accounting guidance, the Company operates as two segments. However, the Company determined that its two operating segments are sufficiently similar and should be aggregated under the criteria provided in the related accounting guidance.

Given the integrated approach to the multi-discipline problem-solving needs of the Company’s customers, a single sale of software may contain components from multiple product areas and include combined technologies. The Company also has a multi-year product and integration strategy that will result in new, combined products or changes to the historical product offerings. As a result, it is impracticable for the Company to provide accurate historical or current reporting among its various product lines.

Accounting Policies

9 Months Ended

Sep. 30, 2013

Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared by ANSYS in accordance with accounting principles generally accepted in the United States for interim financial information for commercial and industrial companies and the instructions to the Quarterly Report on Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, the accompanying statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. The accompanying condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements (and notes thereto) included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012. The condensed consolidated December 31, 2012 balance sheet presented is derived from the audited December 31, 2012 balance sheet included in the most recent Annual Report on Form 10-K. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements have been included, and all adjustments are of a normal and recurring nature. Operating results for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for any future period.

Cash and Cash Equivalents

Cash and cash equivalents consist primarily of highly liquid investments such as deposits held at major banks and money market mutual funds. Cash equivalents are carried at cost, which approximates fair value. The Company’s cash and cash equivalent balances comprise the following:



	September 30, 2013			December 31, 2012
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	400,468	56.6	$	369,724	64.1
Money market mutual funds	306,866		43.4	206,979		35.9
Total	$	707,334		$	576,703

The Company held 98% of its money market mutual fund balances in various funds of a single issuer as of both September 30, 2013 and December 31, 2012.

Acquisitions

9 Months Ended

Sep. 30, 2013

Acquisitions

EVEN - Evolutionary Engineering AG

On April 2, 2013, the Company acquired EVEN - Evolutionary Engineering AG ("EVEN"), a leading provider of composite analysis and optimization technology. Under the terms of the agreement, ANSYS acquired 100% of EVEN for a purchase price of $8.1 million, which consisted of $4.5 million in cash and an estimated $3.6 million of contingent consideration based on EVEN's achievement of certain technical milestones during the three years following the acquisition date.

The operating results of EVEN have been included in the Company's condensed consolidated financial statements since the date of acquisition, April 2, 2013. The total consideration transferred was allocated to the assets and liabilities of EVEN based on management's estimates of the fair values of the assets acquired and the liabilities assumed. The allocation included $2.6 million to identifiable intangible assets including customer lists and core technology, to be amortized over a period of five years, and $5.9 million to goodwill, which is not tax deductible. The fair values of the assets acquired and liabilities assumed are based on preliminary calculations and the estimates and assumptions for these items are subject to change as additional information about what was known and knowable at the acquisition date is obtained during the measurement period (up to one year from the acquisition date). The operating results of EVEN are not material to the condensed consolidated financial statements.

Esterel Technologies, S.A.

On August 1, 2012, the Company completed its acquisition of Esterel Technologies, S.A. ("Esterel"). Under the terms of the agreement, ANSYS acquired 100% of Esterel for a purchase price of $58.2 million, which included $13.1 million in acquired cash. The agreement also includes retention provisions for key members of management and employees, which are accounted for outside of the business combination. The Company funded the transaction entirely with existing cash balances. The operating results of Esterel have been included in the Company's condensed consolidated financial statements since the date of acquisition, August 1, 2012.

In valuing deferred revenue on the Esterel balance sheet as of the acquisition date, the Company applied the fair value provisions applicable to the accounting for business combinations. Although this acquisition accounting requirement had no impact on the Company’s business or cash flow, the Company’s reported revenue under accounting principles generally accepted in the United States, primarily for the first 12 months post-acquisition, will be less than the sum of what would otherwise have been reported by Esterel and ANSYS absent the acquisition. Acquired deferred revenue of $1.1 million was recorded on the opening balance sheet. This amount was approximately $11.0 million lower than the historical carrying value. The impact on reported revenue for the three and nine months ended September 30, 2013 was $0.7 million and $3.5 million, respectively. The expected impact on reported revenue is $0.6 million and $1.4 million for the quarter ending December 31, 2013 and for the year ending December 31, 2014, respectively.

The assets and liabilities of Esterel have been recorded based upon management's estimates of their fair market values as of the acquisition date. The following tables summarize the fair value of consideration transferred and the fair values of identified assets acquired and liabilities assumed at the acquisition date:

Fair Value of Consideration Transferred:



(in thousands)
Cash	$	58,150

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed:



(dollars in thousands)
Cash	$	13,075
Accounts receivable and other tangible assets	4,737
Customer relationships (12-year life)	21,421
Developed software (10-year life)	10,717
Platform trade name (indefinite life)	2,695
Accounts payable and other liabilities	(4,707		)
Deferred revenue	(1,139		)
Net deferred tax liabilities	(7,096		)
Total identifiable net assets	$	39,703
Goodwill	$	18,447

The goodwill, which is not tax deductible, is attributed to intangible assets that do not qualify for separate recognition, including the assembled workforce of the acquired business and the synergies expected to arise as a result of the acquisition of Esterel. During the one-year measurement period since the Esterel acquisition date, the Company decreased the value of net deferred tax liabilities from $10.0 million to $7.1 million, with the offset recorded to goodwill. This adjustment was based on additional information regarding what was known and knowable in the calculation of the net deferred tax liabilities as of the acquisition date.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Other Current Assets

9 Months Ended

Sep. 30, 2013

Other Current Assets

The Company reports accounts receivable, related to the current portion of annual lease licenses and software maintenance that has not yet been recognized as revenue, as components of other receivables and current assets. These receivables totaled $95.1 million and $149.3 million as of September 30, 2013 and December 31, 2012, respectively.

The Company reports income taxes receivable, including amounts related to overpayments and refunds, as a component of other receivables and current assets. These amounts totaled $35.4 million and $48.9 million as of September 30, 2013 and December 31, 2012, respectively.

Uncertain Tax Positions

9 Months Ended

Sep. 30, 2013

Uncertain Tax Positions


5.	Uncertain Tax Positions

The Company reports reserves for uncertain tax positions, including estimated penalties and interest, in the condensed consolidated balance sheets. These amounts totaled $36.5 million and $37.0 million as of September 30, 2013 and December 31, 2012, respectively.

The Company believes that it is reasonably possible that $17.2 million of uncertain tax positions will be resolved within the next twelve months.

Earnings Per Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share

Basic earnings per share ("EPS") amounts are computed by dividing earnings by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive equivalents outstanding. To the extent stock options are anti-dilutive, they are excluded from the calculation of diluted EPS.

The details of basic and diluted EPS are as follows:



	Three Months Ended				Nine Months Ended
(in thousands, except per share data)	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
Net income	$	62,430	$	51,619	$	169,398	$	147,420
Weighted average shares outstanding – basic	92,541		92,448		92,770		92,631
Dilutive effect of stock plans	2,724		2,307		2,387		2,327
Weighted average shares outstanding – diluted	95,265		94,755		95,157		94,958
Basic earnings per share	$	0.67	$	0.56	$	1.83	$	1.59
Diluted earnings per share	$	0.66	$	0.54	$	1.78	$	1.55
Anti-dilutive options	1,148		1,216		1,145		1,291

Long-Term Debt

9 Months Ended

Sep. 30, 2013

Long-Term Debt

The Company paid the outstanding balance on its term loan at maturity on July 31, 2013. The Company recorded interest expense related to the term loan at average interest rates of 0.95% during July 2013 and 1.04% for the seven-month period ended July 31, 2013. For the three and nine months ended September 30, 2012, the Company recorded interest expense related to the term loan at average interest rates of 1.21% and 1.25%, respectively.

The interest expense on the term loan and amortization related to debt financing costs were as follows:



	Three Months Ended
	September 30, 2013				September 30, 2012
(in thousands)	Interest Expense		Amortization		Interest Expense		Amortization
July 31, 2008 term loan	$	22	$	4	$	329	$	172



	Nine Months Ended
	September 30, 2013				September 30, 2012
(in thousands)	Interest Expense		Amortization		Interest Expense		Amortization
July 31, 2008 term loan	$	230	$	149	$	1,117	$	565

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2013

Text Block [Abstract]

Goodwill and Intangible Assets Disclosure [Text Block]

Goodwill and Intangible Assets

As of September 30, 2013 and December 31, 2012, the Company’s intangible assets and estimated useful lives are classified as follows:



	September 30, 2013					December 31, 2012
(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Amortized intangible assets:
Developed software and core technologies (5 – 10 years)	$	300,295	$	(196,638	)	$	298,802	$	(175,988	)
Customer lists and contract backlog (3 – 15 years)	238,669		(115,397		)	241,721		(100,702		)
Trade names (6 – 10 years)	102,625		(48,341		)	102,629		(40,436		)
Total	$	641,589	$	(360,376	)	$	643,152	$	(317,126	)
Unamortized intangible assets:
Trade names	$	24,620				$	25,147

Amortization expense for the intangible assets reflected above was $14.8 million and $17.0 million for the three months ended September 30, 2013 and 2012, respectively. Amortization expense for the intangible assets reflected above was $46.4 million and $50.6 million for the nine months ended September 30, 2013 and 2012, respectively.

As of September 30, 2013, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2013	$	14,222
2014	54,219
2015	50,567
2016	43,414
2017	39,639
2018	26,019
Thereafter	53,133
Total intangible assets subject to amortization	281,213
Indefinite-lived trade names	24,620
Other intangible assets, net	$	305,833

The change in goodwill during the nine months ended September 30, 2013 was as follows:



(in thousands)
Beginning balance – January 1, 2013	$	1,251,247
Acquisition of EVEN	5,936
Currency translation and other	(1,908		)
Ending balance – September 30, 2013	$	1,255,275

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Fair Value Measurement

9 Months Ended

Sep. 30, 2013

Fair Value Measurement

The valuation hierarchy for disclosure of assets and liabilities reported at fair value prioritizes the inputs for such valuations into three broad levels:


•	Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities;


•	Level 2: quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; or


•	Level 3: unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value.

A financial asset's or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following tables provide the assets and liabilities carried at fair value and measured on a recurring basis:



				Fair Value Measurements at Reporting Date Using:
(in thousands)	September 30, 2013			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	306,866		$	306,866	$	—	$	—
Short-term investments	$	440		$	—	$	440	$	—
Liabilities
Contingent consideration	$	(7,205	)	$	—	$	—	$	(7,205	)
Deferred compensation	$	(700	)	$	—	$	—	$	(700	)



				Fair Value Measurements at Reporting Date Using:
(in thousands)	December 31, 2012			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	206,979		$	206,979	$	—		$	—
Short-term investments	$	452		$	—	$	452		$	—
Liabilities
Contingent consideration	$	(6,436	)	$	—	$	—		$	(6,436	)
Deferred compensation	$	(1,394	)	$	—	$	—		$	(1,394	)
Foreign currency future	$	(240	)	$	—	$	(240	)	$	—

The cash equivalents in the preceding tables represent money market mutual funds.

The short-term investments in the preceding tables represent deposits held by certain foreign subsidiaries of the Company. The deposits have fixed interest rates with maturity dates ranging from three months to one year.

The contingent consideration in the table above represents potential future payments related to the EVEN and Apache Design, Inc. ("Apache") acquisitions in accordance with the respective merger agreements. The deferred compensation in the table above is attributable to a retention agreement for a key member of Apache management, and was accounted for outside of that business combination. The net present value calculations for the contingent consideration and deferred compensation include significant unobservable inputs in the assumption that all remaining payments will be made, and therefore the liabilities were classified as Level 3 in the fair value hierarchy.

The foreign currency future contract was settled in August 2013 and did not have a material impact on the Company's results of operations for the three or nine month periods ended September 30, 2013.

The following tables present the changes in the Company’s Level 3 liabilities that are measured at fair value on a recurring basis during the three and nine months ended September 30, 2013 and 2012:



	Fair Value Measurement Using Significant Unobservable Inputs
(in thousands)	Contingent Consideration			Deferred Compensation
Balance as of January 1, 2013	$	6,436		$	1,394
Interest expense included in earnings	31			6
Balance as of March 31, 2013	$	6,467		$	1,400
EVEN contingent consideration	3,597			—
Interest expense and foreign exchange activity included in earnings	134			7
Balance as of June 30, 2013	$	10,198		$	1,407
Contingent payments	(3,288		)	(712		)
Interest expense and foreign exchange activity included in earnings	295			5
Balance as of September 30, 2013	$	7,205		$	700



	Fair Value Measurement Using Significant Unobservable Inputs
(in thousands)	Contingent Consideration			Deferred Compensation
Balance as of January 1, 2012	$	9,571		$	2,073
Interest expense included in earnings	43			9
Balance as of March 31, 2012	$	9,614		$	2,082
Interest expense included in earnings	43			9
Balance as of June 30, 2012	$	9,657		$	2,091
Contingent payments	(3,288		)	(712		)
Interest expense included in earnings	35			8
Balance as of September 30, 2012	$	6,404		$	1,387

The carrying values of cash, accounts receivable, accounts payable, accrued expenses, other accrued liabilities and short-term obligations approximate their fair values because of their short-term nature.

Geographic Information

9 Months Ended

Sep. 30, 2013

Geographic Information

Revenue to external customers is attributed to individual countries based upon the location of the customer. Revenue by geographic area is as follows:



	Three Months Ended				Nine Months Ended
(in thousands)	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
United States	$	72,671	$	65,345	$	214,342	$	195,407
Japan	25,835		31,676		81,538		90,850
Germany	23,892		20,195		68,905		60,648
Canada	3,508		2,510		10,341		8,778
Other European	48,257		41,023		142,494		125,163
Other international	38,495		36,160		107,620		96,424
Total revenue	$	212,658	$	196,909	$	625,240	$	577,270

Property and equipment by geographic area is as follows:



(in thousands)	September 30, 2013		December 31, 2012
United States	$	40,697	$	36,716
United Kingdom	3,011		3,532
India	2,892		3,392
France	2,182		2,378
Germany	2,109		2,087
Japan	1,291		1,253
Canada	635		753
Other international	1,080		969
Other European	1,055		1,173
Total property and equipment	$	54,952	$	52,253

Stock Repurchase Program

9 Months Ended

Sep. 30, 2013

Treasury Stock [Text Block]


	Stock Repurchase Program

In February 2013, ANSYS announced that its Board of Directors approved an increase to its authorized stock repurchase program. Under the Company’s stock repurchase program, the Company repurchased 988,000 shares during the nine months ended September 30, 2013 at an average price per share of $74.35, for a total cost of $73.5 million. During the nine months ended September 30, 2012, the Company repurchased 1.0 million shares at an average price per share of $61.59, for a total cost of $61.6 million. As of September 30, 2013, approximately 2.0 million shares remained authorized for repurchase under the program.

Stock-based Compensation

9 Months Ended

Sep. 30, 2013

Stock-based Compensation

Total stock-based compensation expense and its net impact on basic and diluted earnings per share are as follows:



	Three Months Ended						Nine Months Ended
(in thousands, except per share data)	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Cost of sales:
Software licenses	$	335		$	369		$	1,023		$	1,139
Maintenance and service	590			558			1,762			1,680
Operating expenses:
Selling, general and administrative	4,392			3,873			12,755			11,275
Research and development	3,764			3,304			11,202			9,836
Stock-based compensation expense before taxes	9,081			8,104			26,742			23,930
Related income tax benefits	(2,623		)	(2,062		)	(8,490		)	(6,330		)
Stock-based compensation expense, net of taxes	$	6,458		$	6,042		$	18,252		$	17,600
Net impact on earnings per share
Basic earnings per share	$	(0.07	)	$	(0.07	)	$	(0.20	)	$	(0.19	)
Diluted earnings per share	$	(0.07	)	$	(0.06	)	$	(0.19	)	$	(0.19	)

Contingencies and Commitments

9 Months Ended

Sep. 30, 2013

Contingencies and Commitments

The Company is subject to various investigations, claims and legal proceedings that arise in the ordinary course of business, including alleged infringement of intellectual property rights, commercial disputes, labor and employment matters, tax audits and other matters. In the opinion of the Company, the resolution of pending matters is not expected to have a material, adverse effect on the Company’s consolidated results of operations, cash flows or financial position. However, each of these matters is subject to various uncertainties and it is possible that an unfavorable resolution of one or more of these proceedings could materially affect the Company’s results of operations, cash flows or financial position.

An Indian subsidiary of the Company received a formal inquiry after a service tax audit. The service tax issues raised in the Company’s notice are very similar to the case, M/s Microsoft Corporation (I) (P) Ltd. Vs Commissions of Service Tax, currently being appealed to the Delhi Customs, Excise and Service Tax Appellate Tribunal (CESTAT). If the ruling is in favor of Microsoft, the Company expects a similar outcome for its audit case. If the ruling is unfavorable in the case of Microsoft, the Company could incur tax charges and related liabilities, including those related to the service tax audit case, of approximately $6 million. Of the two judicial members assigned to the Microsoft appeal, one member has ruled in favor of Microsoft and one has ruled in favor of the Commission. A third deciding judge will be appointed for a final decision. The Company can provide no assurances as to the outcome of the Microsoft appeal or to the impact of the Microsoft appeal on the Company’s audit case. The Company is uncertain as to when the service tax audit will be completed.

The Company sells software licenses and services to its customers under proprietary software license agreements. Each license agreement contains the relevant terms of the contractual arrangement with the customer, and generally includes certain provisions for indemnifying the customer against losses, expenses and liabilities from damages that are incurred by or awarded against the customer in the event the Company’s software or services are found to infringe upon a patent, copyright or other proprietary right of a third party. To date, the Company has not had to reimburse any of its customers for any losses related to these indemnification provisions and no material claims asserted under these indemnification provisions are outstanding as of September 30, 2013. For several reasons, including the lack of prior material indemnification claims, the Company cannot determine the maximum amount of potential future payments, if any, related to such indemnification provisions.

Sale-Leaseback Arrangement (Notes)	9 Months Ended
Sale-Leaseback Arrangement (Notes)	Sep. 30, 2013
Sale-Leaseback Arrangement [Abstract]
Sale Leaseback Transaction Disclosure [Text Block]	Sale-Leaseback Arrangement In September 2012, ANSYS entered into a build-to-suit lease agreement for approximately 186,000 square feet of rentable space to be located in an office facility in Canonsburg, PA, which will serve as the Company's headquarters. The office facility will be delivered to the Company no later than October 1, 2014, with the base rental payments beginning three months thereafter. The term of the lease is 183 months. Under the terms of the agreement, the Company is responsible for paying the cost of certain tenant improvements that exceed an allowance to be paid by the landlord. There is no cap to the Company's obligation in excess of the landlord allowance, and the improvements do not meet the definition of "normal tenant improvements" as defined in the accounting guidance. As a result, the Company is considered the owner of the building during the construction period and the lease is subject to sale-leaseback treatment. As of September 30, 2013, the Company has recorded an $11.2 million construction-in-progress asset and a corresponding liability for construction debt funded by the lessor on its condensed consolidated balance sheet. Upon completion and delivery of the building, the Company will determine whether the lease meets the criteria for capital treatment under the accounting guidance, or whether it has continuing involvement in the lease. If it is determined the lease fails to meet the capitalization criteria, and the Company does not have continuing involvement in the lease, the construction-in-progress asset and liability will be removed from the balance sheet. The sale-leaseback treatment of the lease during the construction period does not have any impact on the Company's results of operations or cash flows.

New Accounting Guidance

9 Months Ended

Sep. 30, 2013

New Accounting Guidance

Testing Indefinite-Lived Intangible Assets for Impairment: In July 2012, new accounting guidance was issued regarding the requirement to test indefinite-lived intangible assets for impairment. Previous guidance required an entity to test indefinite-lived intangible assets for impairment, on at least an annual basis, by comparing the fair value of the asset with its carrying amount. If the carrying amount of the intangible asset exceeds its fair value, an entity should recognize an impairment loss in the amount of that excess. Under the new guidance, an entity has an option not to calculate annually the fair value of an indefinite-lived intangible asset if the entity determines that it is not more likely than not that the asset is impaired. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the asset is impaired, then performing the quantitative test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the quantitative test and record any impairment if necessary. This guidance was adopted by the Company effective January 1, 2013, and it did not have any impact on the Company's financial position, results of operations or cash flows.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2013

Basis of Presentation

Cash and Cash Equivalents



	September 30, 2013			December 31, 2012
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	400,468	56.6	$	369,724	64.1
Money market mutual funds	306,866		43.4	206,979		35.9
Total	$	707,334		$	576,703

The Company held 98% of its money market mutual fund balances in various funds of a single issuer as of both September 30, 2013 and December 31, 2012.

- Definition

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

+ References + Details

Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2013

Cash and Cash Equivalents

The Company’s cash and cash equivalent balances comprise the following:



	September 30, 2013			December 31, 2012
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	400,468	56.6	$	369,724	64.1
Money market mutual funds	306,866		43.4	206,979		35.9
Total	$	707,334		$	576,703

Acquisitions (Tables) - Esterel Technologies Societe Anonyme [Member]

9 Months Ended

Sep. 30, 2013

Fair Value of Consideration Transferred

Fair Value of Consideration Transferred:



(in thousands)
Cash	$	58,150

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed:



(dollars in thousands)
Cash	$	13,075
Accounts receivable and other tangible assets	4,737
Customer relationships (12-year life)	21,421
Developed software (10-year life)	10,717
Platform trade name (indefinite life)	2,695
Accounts payable and other liabilities	(4,707		)
Deferred revenue	(1,139		)
Net deferred tax liabilities	(7,096		)
Total identifiable net assets	$	39,703
Goodwill	$	18,447

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Details of Basic and Diluted EPS

The details of basic and diluted EPS are as follows:



	Three Months Ended				Nine Months Ended
(in thousands, except per share data)	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
Net income	$	62,430	$	51,619	$	169,398	$	147,420
Weighted average shares outstanding – basic	92,541		92,448		92,770		92,631
Dilutive effect of stock plans	2,724		2,307		2,387		2,327
Weighted average shares outstanding – diluted	95,265		94,755		95,157		94,958
Basic earnings per share	$	0.67	$	0.56	$	1.83	$	1.59
Diluted earnings per share	$	0.66	$	0.54	$	1.78	$	1.55
Anti-dilutive options	1,148		1,216		1,145		1,291

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2013

Interest Expense on Term Loan and Amortization Related to Debt Financing Costs

The interest expense on the term loan and amortization related to debt financing costs were as follows:



	Three Months Ended
	September 30, 2013				September 30, 2012
(in thousands)	Interest Expense		Amortization		Interest Expense		Amortization
July 31, 2008 term loan	$	22	$	4	$	329	$	172



	Nine Months Ended
	September 30, 2013				September 30, 2012
(in thousands)	Interest Expense		Amortization		Interest Expense		Amortization
July 31, 2008 term loan	$	230	$	149	$	1,117	$	565

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2013

Intangible Assets and Estimated Useful Lives

As of September 30, 2013 and December 31, 2012, the Company’s intangible assets and estimated useful lives are classified as follows:



	September 30, 2013					December 31, 2012
(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Amortized intangible assets:
Developed software and core technologies (5 – 10 years)	$	300,295	$	(196,638	)	$	298,802	$	(175,988	)
Customer lists and contract backlog (3 – 15 years)	238,669		(115,397		)	241,721		(100,702		)
Trade names (6 – 10 years)	102,625		(48,341		)	102,629		(40,436		)
Total	$	641,589	$	(360,376	)	$	643,152	$	(317,126	)
Unamortized intangible assets:
Trade names	$	24,620				$	25,147

Estimated Future Amortization Expense for Intangible Assets

s of September 30, 2013, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2013	$	14,222
2014	54,219
2015	50,567
2016	43,414
2017	39,639
2018	26,019
Thereafter	53,133
Total intangible assets subject to amortization	281,213
Indefinite-lived trade names	24,620
Other intangible assets, net	$	305,833

Changes in Goodwill

he change in goodwill during the nine months ended September 30, 2013 was as follows:



(in thousands)
Beginning balance – January 1, 2013	$	1,251,247
Acquisition of EVEN	5,936
Currency translation and other	(1,908		)
Ending balance – September 30, 2013	$	1,255,275

Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value of Assets and Liabilities Measured on Recurring Basis

The following tables provide the assets and liabilities carried at fair value and measured on a recurring basis:



				Fair Value Measurements at Reporting Date Using:
(in thousands)	September 30, 2013			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	306,866		$	306,866	$	—	$	—
Short-term investments	$	440		$	—	$	440	$	—
Liabilities
Contingent consideration	$	(7,205	)	$	—	$	—	$	(7,205	)
Deferred compensation	$	(700	)	$	—	$	—	$	(700	)



				Fair Value Measurements at Reporting Date Using:
(in thousands)	December 31, 2012			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	206,979		$	206,979	$	—		$	—
Short-term investments	$	452		$	—	$	452		$	—
Liabilities
Contingent consideration	$	(6,436	)	$	—	$	—		$	(6,436	)
Deferred compensation	$	(1,394	)	$	—	$	—		$	(1,394	)
Foreign currency future	$	(240	)	$	—	$	(240	)	$	—

Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs



	Fair Value Measurement Using Significant Unobservable Inputs
(in thousands)	Contingent Consideration			Deferred Compensation
Balance as of January 1, 2013	$	6,436		$	1,394
Interest expense included in earnings	31			6
Balance as of March 31, 2013	$	6,467		$	1,400
EVEN contingent consideration	3,597			—
Interest expense and foreign exchange activity included in earnings	134			7
Balance as of June 30, 2013	$	10,198		$	1,407
Contingent payments	(3,288		)	(712		)
Interest expense and foreign exchange activity included in earnings	295			5
Balance as of September 30, 2013	$	7,205		$	700



	Fair Value Measurement Using Significant Unobservable Inputs
(in thousands)	Contingent Consideration			Deferred Compensation
Balance as of January 1, 2012	$	9,571		$	2,073
Interest expense included in earnings	43			9
Balance as of March 31, 2012	$	9,614		$	2,082
Interest expense included in earnings	43			9
Balance as of June 30, 2012	$	9,657		$	2,091
Contingent payments	(3,288		)	(712		)
Interest expense included in earnings	35			8
Balance as of September 30, 2012	$	6,404		$	1,387

Geographic Information (Tables)

9 Months Ended

Sep. 30, 2013

Revenue by Geographic Area

Revenue by geographic area is as follows:



	Three Months Ended				Nine Months Ended
(in thousands)	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
United States	$	72,671	$	65,345	$	214,342	$	195,407
Japan	25,835		31,676		81,538		90,850
Germany	23,892		20,195		68,905		60,648
Canada	3,508		2,510		10,341		8,778
Other European	48,257		41,023		142,494		125,163
Other international	38,495		36,160		107,620		96,424
Total revenue	$	212,658	$	196,909	$	625,240	$	577,270

Property and Equipment by Geographic Area

Property and equipment by geographic area is as follows:



(in thousands)	September 30, 2013		December 31, 2012
United States	$	40,697	$	36,716
United Kingdom	3,011		3,532
India	2,892		3,392
France	2,182		2,378
Germany	2,109		2,087
Japan	1,291		1,253
Canada	635		753
Other international	1,080		969
Other European	1,055		1,173
Total property and equipment	$	54,952	$	52,253

Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Stock-Based Compensation Expense, and its net Impact on Basic and Diluted Earnings per Share

Total stock-based compensation expense and its net impact on basic and diluted earnings per share are as follows:



	Three Months Ended						Nine Months Ended
(in thousands, except per share data)	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Cost of sales:
Software licenses	$	335		$	369		$	1,023		$	1,139
Maintenance and service	590			558			1,762			1,680
Operating expenses:
Selling, general and administrative	4,392			3,873			12,755			11,275
Research and development	3,764			3,304			11,202			9,836
Stock-based compensation expense before taxes	9,081			8,104			26,742			23,930
Related income tax benefits	(2,623		)	(2,062		)	(8,490		)	(6,330		)
Stock-based compensation expense, net of taxes	$	6,458		$	6,042		$	18,252		$	17,600
Net impact on earnings per share
Basic earnings per share	$	(0.07	)	$	(0.07	)	$	(0.20	)	$	(0.19	)
Diluted earnings per share	$	(0.07	)	$	(0.06	)	$	(0.19	)	$	(0.19	)

Organization - Additional Information (Detail)	9 Months Ended
Organization - Additional Information (Detail)	Sep. 30, 2013 Segment
Organization and Nature of Operations [Line Items]
Number of operating segments	2

Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Cash and Cash Equivalents [Line Items]
Cash accounts, Amount	$ 400,468	$ 369,724
Money market mutual funds, Amount	306,866	206,979
Total	$ 707,334	$ 576,703	$ 554,887	$ 471,828
Cash accounts, % of Total	56.60%	64.10%
Money market mutual funds, % of Total	43.40%	35.90%

Accounting Policies Cash and Cash Equivalents (Parenthetical) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Cash and Cash Equivalents [Member] \| Money Market Funds [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	98.00%	98.00%

Acquisition - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended
	Apr. 03, 2013	Aug. 01, 2012	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill			$ 1,255,275	$ 1,255,275	$ 1,251,247
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent		$ 10,000
EVEN-Evolutionary Engineering Aktiengesellschaft [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 8,100
Business Acquisition, Cost of Acquired Entity, Cash Paid	$ 4,500
Business acquisition, acquisition percentage	100.00%
Business Combination, Contingent Consideration, Liability	$ 3,597
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	2,600
Goodwill	$ 5,936
Esterel Technologies Societe Anonyme [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		58,150
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		$ 13,075
Business acquisition, acquisition percentage		100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue		$ 1,139
Acquired deferred revenue, amount lower than the historical carrying value recorded on the opening balance sheet		(10,973)
Business Acquisition Write Down Of Deferred Revenue Impact On Reported Revenue			670	3,544
Acquired deferred revenue, expected impact on reported revenue in next quarter			588	588
Goodwill		18,447
Business Acquisition Write Down Of Deferred Revenue Expected Impact On Revenue Next Fiscal Year			$ 1,386	$ 1,386
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent		$ (7,096)

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Aug. 01, 2012	Sep. 30, 2013	Dec. 31, 2012
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	$ 10,000
Goodwill		$ 1,255,275	$ 1,251,247
Esterel Technologies Societe Anonyme [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Consideration Transferred	58,150
Cash and short-term investments	13,075
Accounts receivable and other tangible assets	4,737
Accounts payable and other liabilities	(4,707)
Deferred revenue	(1,139)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	(7,096)
Total identifiable net assets	39,703
Goodwill	18,447
Esterel Technologies Societe Anonyme [Member] \| Developed Software
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	10,717
Esterel Technologies Societe Anonyme [Member] \| Customer Relationships
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	21,421
Platform Trade Names [Member] \| Esterel Technologies Societe Anonyme [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 2,695

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - Esterel Technologies Societe Anonyme [Member]	9 Months Ended
	Sep. 30, 2013
Developed Software
Business Combination, Separately Recognized Transactions [Line Items]
Useful life of intangible assets acquired, in years	10 years
Customer Relationships
Business Combination, Separately Recognized Transactions [Line Items]
Useful life of intangible assets acquired, in years	12 years

Other Current Assets - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Other receivables and current assets	$ 148,652	$ 216,268
Deferred Accounts Receivable Current Portion Of Annual Lease Licenses And Software Maintenance [Member]
Other receivables and current assets	95,100	149,300
Taxes Receivable Related To Overpayments And Refunds
Other receivables and current assets	$ 35,400	$ 48,900

Uncertain Tax Positions - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits Accrued Including Income Tax Penalties And Interest	$ 36.5	$ 37.0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 17.2

Details of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Line Items]
Net income	$ 62,430	$ 51,619	$ 169,398	$ 147,420
Weighted average shares outstanding - basic	92,541	92,448	92,770	92,631
Dilutive effect of stock plans	2,724	2,307	2,387	2,327
Weighted average shares outstanding - diluted	95,265	94,755	95,157	94,958
Basic earnings per share	$ 0.67	$ 0.56	$ 1.83	$ 1.59
Diluted earnings per share	$ 0.66	$ 0.54	$ 1.78	$ 1.55
Anti-dilutive options	1,148	1,216	1,145	1,291

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Debt Instrument [Line Items]
Quarterly principal payments			$ 53,149	$ 47,834
Interest rate on term loan	0.95%	1.21%	1.04%	1.25%

Interest Expense on Term Loan and Amortization Related to Debt Financing Costs (Detail) - July 31, 2008 Term Loan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Debt Disclosure [Line Items]
Interest Expense	$ 22	$ 329	$ 230	$ 1,117
Amortization	$ 4	$ 172	$ 149	$ 565

Intangible Assets and Estimated Useful Lives (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	$ 641,589	$ 643,152
Amortized intangible assets, Accumulated Amortization	(360,376)	(317,126)
Unamortized intangible assets, Gross Carrying Amount	24,620
Trade Names [Member]
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	102,625	102,629
Amortized intangible assets, Accumulated Amortization	(48,341)	(40,436)
Developed software and core technologies
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	300,295	298,802
Amortized intangible assets, Accumulated Amortization	(196,638)	(175,988)
Customer lists and contract backlog
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	238,669	241,721
Amortized intangible assets, Accumulated Amortization	(115,397)	(100,702)
Trade Names [Member]
Intangible Assets [Line Items]
Unamortized intangible assets, Gross Carrying Amount	$ 24,620	$ 25,147

Intangible Assets and Estimated Useful Lives (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2013
Minimum \| Trade Names [Member]
Intangible Assets [Line Items]
Amortized intangible assets, Useful life, in years	6 years
Minimum \| Developed software and core technologies
Intangible Assets [Line Items]
Amortized intangible assets, Useful life, in years	5 years
Minimum \| Customer lists and contract backlog
Intangible Assets [Line Items]
Amortized intangible assets, Useful life, in years	3 years
Maximum \| Trade Names [Member]
Intangible Assets [Line Items]
Amortized intangible assets, Useful life, in years	10 years
Maximum \| Developed software and core technologies
Intangible Assets [Line Items]
Amortized intangible assets, Useful life, in years	10 years
Maximum \| Customer lists and contract backlog
Intangible Assets [Line Items]
Amortized intangible assets, Useful life, in years	15 years

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense for intangible assets	$ 14.8	$ 17.0	$ 46.4	$ 50.6

Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Schedule of Estimated Amortization Expense for Intangible Assets and Unfavorable Lease Liability [Line Items]
Remainder of 2013	$ 14,222
2014	54,219
2015	50,567
2016	43,414
2017	39,639
2018	26,019
Thereafter	53,133
Total intangible assets subject to amortization	281,213
Indefinite-lived trade names	24,620
Other intangible assets, net	$ 305,833	$ 351,173

Changes in Goodwill (Detail) $ in Thousands	9 Months Ended
Changes in Goodwill (Detail) $ in Thousands	Sep. 30, 2013 USD ($)
Goodwill [Line Items]
Beginning balance	$ 1,251,247
Currency translation and other	(1,908)
Ending balance	$ 1,255,275

Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 306,866	$ 206,979
Short-term investments	440	452
Contingent consideration	(7,205)	(6,436)
Deferred compensation	(700)	(1,394)
Foreign Currency Contracts, Liability, Fair Value Disclosure		(240)
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	306,866	206,979
Short-term investments	0	0
Contingent consideration	0	0
Deferred compensation	0	0
Foreign Currency Contracts, Liability, Fair Value Disclosure		0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	440	452
Contingent consideration	0	0
Deferred compensation	0	0
Foreign Currency Contracts, Liability, Fair Value Disclosure		(240)
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Contingent consideration	(7,205)	(6,436)
Deferred compensation	$ (700)	(1,394)
Foreign Currency Contracts, Liability, Fair Value Disclosure		$ 0

Fair Value Measurement - Additional Information (Detail)	Sep. 30, 2013
Fair Value Measurements [Line Items]
Short-term investment time deposits maturity minimum, in months	3 months
Short-term investment time deposits maturity maximum, in years	1 year

Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Apr. 03, 2013
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	$ (3,288)			$ (3,288)
Business Combination, Contingent Consideration, Liability							$ 3,597
Beginning balance	10,198	$ 6,467	$ 6,436	9,657	$ 9,614	$ 9,571
Interest expense included in earnings	295	134	31	35	43	43
Ending balance	7,205	10,198	6,467	6,404	9,657	9,614
Deferred Compensation
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	(712)			(712)
Business Combination, Contingent Consideration, Liability							$ 0
Beginning balance	1,407	1,400	1,394	2,091	2,082	2,073
Interest expense included in earnings	5	7	6	8	9	9
Ending balance	$ 700	$ 1,407	$ 1,400	$ 1,387	$ 2,091	$ 2,082

Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 212,658	$ 196,909	$ 625,240	$ 577,270
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	72,671	65,345	214,342	195,407
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	25,835	31,676	81,538	90,850
GERMANY
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	23,892	20,195	68,905	60,648
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	3,508	2,510	10,341	8,778
Other European
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	48,257	41,023	142,494	125,163
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 38,495	$ 36,160	$ 107,620	$ 96,424

Property and Equipment by Geographic Area (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	$ 54,952	$ 52,253
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	40,697	36,716
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	3,011	3,532
INDIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	2,892	3,392
GERMANY
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	2,109	2,087
FRANCE
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	2,182	2,378
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	1,291	1,253
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	635	753
Other European
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	1,055	1,173
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	$ 1,080	$ 969

Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Stock Repurchase Program [Line Items]
Treasury Stock, Shares, Acquired	1.0	1.0
Payments for Repurchase of Common Stock	$ 73,457	$ 61,591
Treasury Stock Acquired, Average Cost Per Share	$ 74.35	$ 61.59
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	2.0

Stock-Based Compensation Expense, and its net Impact on Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 9,081	$ 8,104	$ 26,742	$ 23,930
Related income tax benefits	(2,623)	(2,062)	(8,490)	(6,330)
Stock-based compensation expense, net of taxes	$ 6,458	$ 6,042	$ 18,252	$ 17,600
Basic earnings per share	$ (0.07)	$ (0.07)	$ (0.20)	$ (0.19)
Diluted earnings per share	$ (0.07)	$ (0.06)	$ (0.19)	$ (0.19)
Software Licenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 335	$ 369	$ 1,023	$ 1,139
Maintenance and Service
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	590	558	1,762	1,680
Selling, General and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	4,392	3,873	12,755	11,275
Research and Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 3,764	$ 3,304	$ 11,202	$ 9,836

Contingencies and Commitments - Additional Information (Detail) $ in Millions	Sep. 30, 2013 USD ($)
Other Commitments And Contingencies [Line Items]
Tax charges and related liabilities if the ruling is unfavorable	$ 6

Sale-Leaseback Arrangement (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Sale Leaseback Transaction [Line Items]
Construction in progress leased facility	$ 11,222	$ 0
Canonsburg Office, New Company Headquarters [Member]
Sale Leaseback Transaction [Line Items]
Original Lease Term	15 years 3 months