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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2017	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
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		84,860,473

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 919,571	$ 822,479
Short-term investments	7,064	381
Accounts receivable, less allowance for doubtful accounts of $6,800 and $5,700, respectively	91,356	107,192
Other receivables and current assets	183,683	239,349
Total current assets	1,201,674	1,169,401
Property and equipment, net	57,160	54,677
Goodwill	1,353,444	1,337,215
Other intangible assets, net	154,996	172,619
Other long-term assets	33,633	24,287
Deferred income taxes	45,106	42,327
Total assets	2,846,013	2,800,526
Current liabilities:
Accounts payable	4,257	7,395
Accrued bonuses and commissions	40,375	49,487
Accrued income taxes	4,436	5,263
Other accrued expenses and liabilities	65,557	73,676
Deferred revenue	381,727	403,279
Total current liabilities	496,352	539,100
Long-term liabilities:
Deferred income taxes	1,793	2,259
Other long-term liabilities	60,614	50,762
Total long-term liabilities	62,407	53,021
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 shares issued	932	932
Additional paid-in capital	865,430	883,010
Retained earnings	2,264,331	2,057,665
Treasury stock, at cost: 8,401,924 and 7,548,188 shares, respectively	(804,012)	(675,550)
Accumulated other comprehensive loss	(39,427)	(57,652)
Total stockholders' equity	2,287,254	2,208,405
Total liabilities and stockholders' equity	$ 2,846,013	$ 2,800,526

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 6,800	$ 5,700
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	93,236,023
Treasury stock, shares	8,401,924	7,548,188

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Software licenses	$ 156,580	$ 139,530	$ 448,368	$ 406,668
Maintenance and service	119,005	106,332	344,546	311,169
Total revenue	275,585	245,862	792,914	717,837
Cost of sales:
Software licenses	7,395	6,433	24,197	19,705
Amortization	9,004	9,513	26,892	28,544
Maintenance and service	19,584	19,640	58,263	59,633
Total cost of sales	35,983	35,586	109,352	107,882
Gross profit	239,602	210,276	683,562	609,955
Operating expenses:
Selling, general and administrative	80,015	61,537	230,483	183,565
Research and development	50,144	45,418	153,524	137,533
Amortization	3,260	3,222	9,506	9,581
Total operating expenses	133,419	110,177	393,513	330,679
Operating income	106,183	100,099	290,049	279,276
Interest income	1,910	1,083	4,827	3,110
Other expense, net	(168)	(189)	(1,512)	(137)
Income before income tax provision	107,925	100,993	293,364	282,249
Income tax provision	34,295	31,436	86,698	86,596
Net income	$ 73,630	$ 69,557	$ 206,666	$ 195,653
Earnings per share - basic:
Earnings per share	$ 0.87	$ 0.80	$ 2.43	$ 2.23
Weighted average shares	84,774	86,959	85,132	87,570
Earnings per share - diluted:
Earnings per share	$ 0.85	$ 0.78	$ 2.38	$ 2.19
Weighted average shares	86,588	88,676	86,902	89,355

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 73,630	$ 69,557	$ 206,666	$ 195,653
Other comprehensive income:
Foreign currency translation adjustments	4,149	2,044	18,225	14,267
Comprehensive income	$ 77,779	$ 71,601	$ 224,891	$ 209,920

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 206,666	$ 195,653
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,939	52,320
Deferred income tax benefit	(4,217)	(3,102)
Provision for bad debts	1,382	1,006
Stock-based compensation expense	39,408	24,564
Other	241	(211)
Changes in operating assets and liabilities:
Accounts receivable	17,899	6,601
Other receivables and current assets	60,754	26,431
Other long-term assets	4,495	(80)
Accounts payable, accrued expenses and current liabilities	(22,362)	(23,622)
Accrued income taxes	(221)	4,674
Deferred revenue	(35,502)	(12,178)
Other long-term liabilities	8,478	(5,285)
Net cash provided by operating activities	326,960	266,771
Cash flows from investing activities:
Acquisitions, net of cash acquired	(25,998)	0
Capital expenditures	(14,815)	(8,219)
Other investing activities	(20,810)	(11,355)
Net cash used in investing activities	(61,623)	(19,574)
Cash flows from financing activities:
Purchase of treasury stock	(223,291)	(243,288)
Restricted stock withholding taxes paid in lieu of issued shares	(10,075)	(5,044)
Contingent consideration payments	0	(1,048)
Proceeds from shares issued for stock-based compensation	47,992	43,347
Other financing activities	0	(1)
Net cash used in financing activities	(185,374)	(206,034)
Effect of exchange rate fluctuations on cash and cash equivalents	17,129	12,585
Net increase in cash and cash equivalents	97,092	53,748
Cash and cash equivalents, beginning of period	822,479	784,168
Cash and cash equivalents, end of period	919,571	837,916
Supplemental disclosures of cash flow information:
Income taxes paid	84,760	95,066
Interest paid	$ 163	$ 791

Organization	9 Months Ended
Organization	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	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 and defense, automotive, industrial equipment, electronics, biomedical, energy, materials and chemical processing, and semiconductors. As defined by the accounting guidance for segment reporting, the Company operates as one segment. 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, 2017

Accounting Policies [Abstract]

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, 2016. The condensed consolidated December 31, 2016 balance sheet presented is derived from the audited December 31, 2016 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, 2017 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 funds. Cash equivalents are carried at cost, which approximates fair value. The Company’s cash and cash equivalent balances comprise the following:



	September 30, 2017			December 31, 2016
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	528,134	57.4	$	488,504	59.4
Money market funds	391,437		42.6	333,975		40.6
Total	$	919,571		$	822,479

The Company's money market fund balances are held in various funds of a single issuer.

Acquisitions	9 Months Ended
Acquisitions	Sep. 30, 2017
Business Combinations [Abstract]
Business Combination Disclosure	Acquisitions During the nine months ended September 30, 2017, the Company completed various acquisitions to expand the customer base and accelerate the development of new and innovative products to the marketplace while lowering design and engineering costs for customers. The acquisitions were not individually significant. The combined purchase price of the acquisitions was approximately $28.7 million for the nine months ended September 30, 2017. The Company had no acquisitions during the nine months ended September 30, 2016. The operating results of each acquisition have been included in the Company's condensed consolidated financial statements since each respective date of acquisition. The effects of the business combinations were not material to the Company's consolidated results of operations individually or in the aggregate.

Other Receivables and Current Assets

9 Months Ended

Sep. 30, 2017

Prepaid Expense and Other Assets, Current [Abstract]

Other Receivables and Current Assets

The Company's other receivables and current assets comprise the following balances:



(in thousands)	September 30, 2017		December 31, 2016
Receivables related to unrecognized revenue	$	141,644	$	199,119
Income taxes receivable, including overpayments and refunds	18,615		15,718
Prepaid expenses and other current assets	23,424		24,512
Total other receivables and current assets	$	183,683	$	239,349

Receivables for unrecognized revenue represent the current portion of billings made for annual lease licenses and software maintenance that have not yet been recognized as revenue.

Earnings Per Share

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

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 awards 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, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Net income	$	73,630	$	69,557	$	206,666	$	195,653
Weighted average shares outstanding – basic	84,774		86,959		85,132		87,570
Dilutive effect of stock plans	1,814		1,717		1,770		1,785
Weighted average shares outstanding – diluted	86,588		88,676		86,902		89,355
Basic earnings per share	$	0.87	$	0.80	$	2.43	$	2.23
Diluted earnings per share	$	0.85	$	0.78	$	2.38	$	2.19
Anti-dilutive shares	27		269		112		242

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

The Company's intangible assets and estimated useful lives are classified as follows:



	September 30, 2017					December 31, 2016
(in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Developed software and core technologies (3 – 11 years)	$	355,112	$	(291,960	)	$	338,594	$	(275,130	)
Customer lists and contract backlog (5 – 15 years)	164,548		(100,324		)	159,549		(88,414		)
Trade names (2 – 10 years)	128,346		(101,083		)	127,952		(90,289		)
Total	$	648,006	$	(493,367	)	$	626,095	$	(453,833	)
Indefinite-lived intangible asset:
Trade name	$	357				$	357

Amortization expense for the intangible assets reflected above was $12.3 million and $12.7 million for the three months ended September 30, 2017 and 2016, respectively. Amortization expense for the intangible assets reflected above was $36.4 million and $38.1 million for the nine months ended September 30, 2017 and 2016, respectively.

As of September 30, 2017, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2017	$	12,405
2018	37,466
2019	24,357
2020	23,396
2021	19,169
2022	14,202
Thereafter	23,644
Total intangible assets subject to amortization	154,639
Indefinite-lived trade name	357
Other intangible assets, net	$	154,996

The changes in goodwill during the nine months ended September 30, 2017 and 2016 were as follows:



(in thousands)	2017		2016
Beginning balance – January 1	$	1,337,215	$	1,332,348
Acquisitions	11,719		—
Adjustments	—		(1		)
Currency translation	4,510		1,184
Ending balance – September 30	$	1,353,444	$	1,333,531

During the first quarter of 2017, the Company completed the annual impairment test for goodwill and the indefinite-lived intangible asset and determined that these assets had not been impaired as of the test date, January 1, 2017. No other events or circumstances changed during the nine months ended September 30, 2017 that would indicate that the fair values of the Company's reporting unit and indefinite-lived intangible asset are below their carrying amounts.

- 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, 2017

Fair Value Disclosures [Abstract]

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, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	391,437	$	391,437	$	—	$	—
Short-term investments	$	7,064	$	—	$	7,064	$	—
Deferred compensation plan investments	$	2,256	$	2,256	$	—	$	—



			Fair Value Measurements at Reporting Date Using:
(in thousands)	December 31, 2016		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	333,975	$	333,975	$	—	$	—
Short-term investments	$	381	$	—	$	381	$	—
Deferred compensation plan investments	$	459	$	459	$	—	$	—

The cash equivalents in the preceding tables represent money market 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 deferred compensation plan investments in the preceding tables represent trading securities held in a rabbi trust for the benefit of the non-affiliate independent directors. These securities consist of mutual funds traded in an active market with quoted prices. As a result, the plan assets are classified as Level 1 in the fair value hierarchy. The plan assets are recorded within other long-term assets on the Company's condensed consolidated balance sheets.

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, 2017

Segments, Geographical Areas [Abstract]

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, 2017		September 30, 2016		September 30, 2017		September 30, 2016
United States	$	107,130	$	91,301	$	309,486	$	265,945
Japan	30,778		31,496		94,572		90,601
Germany	25,391		25,399		71,115		73,428
South Korea	15,309		13,381		45,677		41,629
China	16,608		11,271		42,942		29,810
France	15,099		12,054		42,482		36,106
Canada	3,864		3,179		10,368		9,855
Other European	37,455		33,991		107,019		103,765
Other international	23,951		23,790		69,253		66,698
Total revenue	$	275,585	$	245,862	$	792,914	$	717,837

Property and equipment by geographic area is as follows:



(in thousands)	September 30, 2017		December 31, 2016
United States	$	45,521	$	43,810
Europe	5,193		4,753
India	3,685		3,033
Other international	2,761		3,081
Total property and equipment, net	$	57,160	$	54,677

Stock-Based Compensation

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Cost of sales:
Software licenses	$	140		$	187		$	711		$	524
Maintenance and service	739			417			1,894			1,200
Operating expenses:
Selling, general and administrative	8,782			4,292			23,310			11,160
Research and development	5,112			4,056			13,493			11,680
Stock-based compensation expense before taxes	14,773			8,952			39,408			24,564
Related income tax benefits	(6,080		)	(2,993		)	(23,980		)	(7,928		)
Stock-based compensation expense, net of taxes	$	8,693		$	5,959		$	15,428		$	16,636
Net impact on earnings per share:
Basic earnings per share	$	(0.10	)	$	(0.07	)	$	(0.18	)	$	(0.19	)
Diluted earnings per share	$	(0.10	)	$	(0.07	)	$	(0.18	)	$	(0.19	)

As a result of new accounting guidance further discussed in Note 13, the three and nine months ended September 30, 2017 related income tax benefits above include $1.4 million and $11.5 million, respectively, of excess tax benefits that in prior years would have been recorded to additional paid-in capital. If such tax benefits were excluded, the impact on both basic and diluted earnings per share would have been a decrease of $0.02 and $0.13 for the three and nine months ended September 30, 2017, respectively.

Stock Repurchase Program

9 Months Ended

Sep. 30, 2017

Class of Stock Disclosures [Abstract]

Stock Repurchase Program

Under the Company's stock repurchase program, the Company repurchased shares as follows:



	Nine Months Ended
(in thousands, except per share data)	September 30, 2017		September 30, 2016
Number of shares repurchased	2,000		2,700
Average price paid per share	$	111.65	$	90.11
Total cost	$	223,291	$	243,288

In February 2017, the Company's Board of Directors increased the number of shares authorized for repurchase to a total of 5.0 million shares under the stock repurchase program. As of September 30, 2017, 3.5 million shares remained available for repurchase under the program.

Restructuring

9 Months Ended

Sep. 30, 2017

Restructuring and Related Activities [Abstract]

Restructuring

During the fourth quarter of 2016, the Company initiated workforce realignment activities to reallocate resources to align with the Company's future strategic plans. The Company incurred related restructuring charges as follows:



(in thousands)	Gross		Net of Tax
Q4 2016	$	3,419	$	2,355
Q1 2017	9,273		6,176
Q2 2017	2,000		1,435
Q3 2017	466		331
Total restructuring charges	$	15,158	$	10,297

The restructuring charges are included in the presentation of cost of software licenses; cost of maintenance and service; research and development expense; and selling, general and administrative expense. During the nine months ended September 30, 2017, the Company paid $11.3 million of the gross charges. As of September 30, 2017, $3.4 million of the gross charges incurred to date remains unpaid. The Company has completed the workforce realignment activities as of September 30, 2017.

Contingencies and Commitments	9 Months Ended
Contingencies and Commitments	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments The Company is subject to various investigations, claims and legal proceedings that arise in the ordinary course of business, including commercial disputes, labor and employment matters, tax audits, alleged infringement of intellectual property rights 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 has several service tax audits pending that have resulted in formal inquiries being received on transactions through mid-2012. The Company could incur tax charges and related liabilities of approximately $7 million. The service tax issues raised in the Company’s notices and inquiries are very similar to the case, M/s Microsoft Corporation (I) (P) Ltd. Vs Commissioner of Service Tax, New Delhi, wherein the Delhi Customs, Excise and Service Tax Appellate Tribunal (CESTAT) has passed a favorable ruling to Microsoft. The Company can provide no assurances on whether the Microsoft case’s favorable ruling will be challenged in higher courts or on the impact that the present Microsoft case’s decision will have on the Company’s cases. The Company is uncertain as to when these service tax matters will be concluded. A French subsidiary of the Company previously received notice that the French taxing authority rejected the Company's 2012 research and development credit. The Company contested the decision and received a favorable outcome during the first half of 2017. There are currently no challenges to other years' research and development credits for this subsidiary; however, other years are subject to future review and audit. 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, 2017. 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.

New Accounting Guidance	9 Months Ended
New Accounting Guidance	Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Guidance	New Accounting Guidance Revenue from contracts with customers: In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) (ASU 2014-09). ASU 2014-09 supersedes most current revenue recognition guidance, including industry-specific guidance. Previous guidance requires an entity to recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the seller's price to the buyer is fixed or determinable, and collectibility is reasonably assured. Under the new guidance, an entity is required to evaluate revenue recognition by identifying a contract with a customer, identifying the performance obligations in the contract, determining the transaction price, allocating the transaction price to the performance obligations in the contract and recognizing revenue when (or as) the entity satisfies a performance obligation. The standard also requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, delayed the effective date of ASU 2014-09 to annual periods beginning after December 15, 2017, including interim periods within that reporting period. This standard is effective for the Company on January 1, 2018. Entities have the option of using a full retrospective, cumulative effect or modified retrospective approach to adopt ASU 2014-09. The Company expects to utilize the modified retrospective implementation approach. This update will impact the timing and amounts of revenue recognized, which will result in increased volatility in the amount of revenue recognized each period. The Company's preliminary assessment is that the adoption of this standard will have a material impact on the Company’s consolidated financial statements. While the Company expects that the standard will impact various elements of its business, the Company's initial assessment is that the most significant impact will be on the recognition of revenue related to software lease licenses. These licenses include the right to use the software and PCS over the term of the license. These licenses are currently recognized as revenue ratably over the term of the license. Under the new standard and the existing interpretations, the Company expects to recognize a meaningful portion of the revenue related to these licenses up-front at the time the license is delivered. In addition, it is anticipated in the year of adoption there will be an acceleration in the timing of certain income tax payments associated with deferred revenue that will be booked directly to opening retained earnings. The Company has also made a preliminary assessment that the expense related to sales commissions will not be materially different under the new standard. However, the Company's preliminary assessments could change as additional interpretations relating to the new standard are provided and as issues identified by software industry groups are addressed. Business combinations: In January 2017, the FASB issued Accounting Standards Update No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (ASU 2017-01). This update narrows the definition of a business. If substantially all the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, the acquiree is not a business. The update also requires a business to include an input and a substantive process that significantly contributes to the ability to create outputs. This definition is expected to reduce the number of acquisitions accounted for as business combinations, which will impact the accounting treatment of certain items, including the accounting treatment of contingent consideration and transaction expenses. ASU 2017-01 is effective for annual periods beginning after December 15, 2017, including interim periods within that reporting period. Early adoption is permitted and the update will be applied prospectively. The effect of the implementation will depend upon the nature of the Company's future acquisitions, if any. Historically, the Company has entered into acquisitions that would meet the definition of a business under ASU 2017-01. The Company plans to adopt ASU 2017-01 effective January 1, 2018. Income taxes: In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16). Previous guidance requires the tax effects from intra-entity asset transfers to be deferred until the asset is sold to a third party or recovered through use. ASU 2016-16 eliminates this deferral for all intra-entity asset transfers other than inventory. The standard is effective for annual periods beginning after December 15, 2017, including interim periods within that reporting period. Early adoption is permitted and a modified retrospective transition is required upon adoption. The Company plans to adopt ASU 2016-16 effective January 1, 2018 and expects adoption to have an immaterial effect, if any, on its financial results. Credit losses: In June 2016, the FASB issued Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). Previous guidance requires the allowance for doubtful accounts to be estimated based on an incurred loss model, which considers past and current conditions. ASU 2016-13 requires companies to use an expected loss model that also considers reasonable and supportable forecasts of future conditions. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted for annual periods beginning after December 15, 2018, including interim periods within that reporting period. The standard requires a cumulative-effect adjustment to the statement of financial position as of the beginning of the first reporting period in which the guidance is effective. The Company is currently evaluating the effect that this update will have on its financial results upon adoption. Employee share-based payment accounting: In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). This update includes various areas for simplification related to aspects of the accounting for share-based payment transactions. One simplification is that the tax effects of share-based payment settlements will be recorded in the income statement. Prior guidance required tax windfalls at settlement, and tax shortfalls to the extent of previous windfalls, to be recorded in equity. This provision was required to be adopted prospectively. The Company adopted the guidance during the quarter ended March 31, 2017. The primary impact of adoption was the recognition of excess tax benefits in the Company's provision for income taxes rather than paid-in capital, which resulted in the recognition of excess tax benefits in the provision for income taxes of $1.4 million and $11.5 million during the three and nine months ended September 30, 2017, respectively. In addition, the Company applied the change in classification of such benefits from financing to operating on the consolidated statements of cash flows on a retrospective basis, resulting in an increase to both net cash provided by operating activities and net cash used in financing activities of $6.2 million for the nine months ended September 30, 2016. Leases: In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires virtually all leases, other than leases that meet the definition of a short-term lease or leases of intangible assets, to be recorded on the balance sheet with a right-of-use asset and corresponding lease liability. Leases will be classified as either operating or finance leases based on certain criteria. This classification will determine the timing and presentation of expenses on the income statement, as well as the presentation of related cash flows. The standard is effective for annual periods beginning after December 15, 2018, including interim periods within that reporting period. Early adoption is permitted and a modified retrospective transition is required upon adoption. The Company does not expect to early adopt and continues to evaluate the effect that this update will have on its financial results upon adoption. The Company's preliminary assessment is that this update will materially increase the Company's assets and liabilities upon adoption. The Company has completed the initial inventory of its leases and policy elections. The Company is currently developing new processes and controls to meet the accounting and disclosure requirements under the new standard.

Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Basis of Presentation

Cash and Cash Equivalents



	September 30, 2017			December 31, 2016
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	528,134	57.4	$	488,504	59.4
Money market funds	391,437		42.6	333,975		40.6
Total	$	919,571		$	822,479

The Company's money market fund balances are held in various funds of a single issuer.

Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Cash and Cash Equivalents

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



	September 30, 2017			December 31, 2016
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	528,134	57.4	$	488,504	59.4
Money market funds	391,437		42.6	333,975		40.6
Total	$	919,571		$	822,479

Other Receivables and Current Assets (Tables)

9 Months Ended

Sep. 30, 2017

Prepaid Expense and Other Assets, Current [Abstract]

Schedule of Other Receivables and Current Assets

The Company's other receivables and current assets comprise the following balances:



(in thousands)	September 30, 2017		December 31, 2016
Receivables related to unrecognized revenue	$	141,644	$	199,119
Income taxes receivable, including overpayments and refunds	18,615		15,718
Prepaid expenses and other current assets	23,424		24,512
Total other receivables and current assets	$	183,683	$	239,349

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

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, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Net income	$	73,630	$	69,557	$	206,666	$	195,653
Weighted average shares outstanding – basic	84,774		86,959		85,132		87,570
Dilutive effect of stock plans	1,814		1,717		1,770		1,785
Weighted average shares outstanding – diluted	86,588		88,676		86,902		89,355
Basic earnings per share	$	0.87	$	0.80	$	2.43	$	2.23
Diluted earnings per share	$	0.85	$	0.78	$	2.38	$	2.19
Anti-dilutive shares	27		269		112		242

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Estimated Useful Lives

The Company's intangible assets and estimated useful lives are classified as follows:



	September 30, 2017					December 31, 2016
(in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Developed software and core technologies (3 – 11 years)	$	355,112	$	(291,960	)	$	338,594	$	(275,130	)
Customer lists and contract backlog (5 – 15 years)	164,548		(100,324		)	159,549		(88,414		)
Trade names (2 – 10 years)	128,346		(101,083		)	127,952		(90,289		)
Total	$	648,006	$	(493,367	)	$	626,095	$	(453,833	)
Indefinite-lived intangible asset:
Trade name	$	357				$	357

Estimated Future Amortization Expense for Intangible Assets

As of September 30, 2017, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2017	$	12,405
2018	37,466
2019	24,357
2020	23,396
2021	19,169
2022	14,202
Thereafter	23,644
Total intangible assets subject to amortization	154,639
Indefinite-lived trade name	357
Other intangible assets, net	$	154,996

Changes in Goodwill

The changes in goodwill during the nine months ended September 30, 2017 and 2016 were as follows:



(in thousands)	2017		2016
Beginning balance – January 1	$	1,337,215	$	1,332,348
Acquisitions	11,719		—
Adjustments	—		(1		)
Currency translation	4,510		1,184
Ending balance – September 30	$	1,353,444	$	1,333,531

Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

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, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	391,437	$	391,437	$	—	$	—
Short-term investments	$	7,064	$	—	$	7,064	$	—
Deferred compensation plan investments	$	2,256	$	2,256	$	—	$	—



			Fair Value Measurements at Reporting Date Using:
(in thousands)	December 31, 2016		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	333,975	$	333,975	$	—	$	—
Short-term investments	$	381	$	—	$	381	$	—
Deferred compensation plan investments	$	459	$	459	$	—	$	—

Geographic Information (Tables)

9 Months Ended

Sep. 30, 2017

Segments, Geographical Areas [Abstract]

Revenue by Geographic Area

Revenue by geographic area is as follows:



	Three Months Ended				Nine Months Ended
(in thousands)	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016
United States	$	107,130	$	91,301	$	309,486	$	265,945
Japan	30,778		31,496		94,572		90,601
Germany	25,391		25,399		71,115		73,428
South Korea	15,309		13,381		45,677		41,629
China	16,608		11,271		42,942		29,810
France	15,099		12,054		42,482		36,106
Canada	3,864		3,179		10,368		9,855
Other European	37,455		33,991		107,019		103,765
Other international	23,951		23,790		69,253		66,698
Total revenue	$	275,585	$	245,862	$	792,914	$	717,837

Property and Equipment by Geographic Area

Property and equipment by geographic area is as follows:



(in thousands)	September 30, 2017		December 31, 2016
United States	$	45,521	$	43,810
Europe	5,193		4,753
India	3,685		3,033
Other international	2,761		3,081
Total property and equipment, net	$	57,160	$	54,677

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Cost of sales:
Software licenses	$	140		$	187		$	711		$	524
Maintenance and service	739			417			1,894			1,200
Operating expenses:
Selling, general and administrative	8,782			4,292			23,310			11,160
Research and development	5,112			4,056			13,493			11,680
Stock-based compensation expense before taxes	14,773			8,952			39,408			24,564
Related income tax benefits	(6,080		)	(2,993		)	(23,980		)	(7,928		)
Stock-based compensation expense, net of taxes	$	8,693		$	5,959		$	15,428		$	16,636
Net impact on earnings per share:
Basic earnings per share	$	(0.10	)	$	(0.07	)	$	(0.18	)	$	(0.19	)
Diluted earnings per share	$	(0.10	)	$	(0.07	)	$	(0.18	)	$	(0.19	)

Stock Repurchase Program (Tables)

9 Months Ended

Sep. 30, 2017

Class of Stock Disclosures [Abstract]

Stock Repurchase Program

Under the Company's stock repurchase program, the Company repurchased shares as follows:



	Nine Months Ended
(in thousands, except per share data)	September 30, 2017		September 30, 2016
Number of shares repurchased	2,000		2,700
Average price paid per share	$	111.65	$	90.11
Total cost	$	223,291	$	243,288

Restructuring (Tables)

9 Months Ended

Sep. 30, 2017

Restructuring and Related Activities [Abstract]

Restructuring

The Company incurred related restructuring charges as follows:



(in thousands)	Gross		Net of Tax
Q4 2016	$	3,419	$	2,355
Q1 2017	9,273		6,176
Q2 2017	2,000		1,435
Q3 2017	466		331
Total restructuring charges	$	15,158	$	10,297

Organization - Additional Information (Detail)	9 Months Ended
Organization - Additional Information (Detail)	Sep. 30, 2017 Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	1

Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cash accounts, Amount	$ 528,134	$ 488,504
Money market funds, Amount	391,437	333,975
Total	$ 919,571	$ 822,479	$ 837,916	$ 784,168
Cash accounts, % of Total	57.43%	59.39%
Money market funds, % of Total	42.57%	40.61%

Accounting Policies - Additional Information (Detail)	Sep. 30, 2017	Dec. 31, 2016
Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Concentration Risk, Percentage	100.00%	100.00%

Acquisitions - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Business Combination [Abstract]
Business Combination, Consideration Transferred	$ 28.7

Other Receivables and Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other receivables and current assets	$ 183,683	$ 239,349
Deferred Accounts Receivable Current Portion Of Annual Lease Licenses And Software Maintenance [Member]
Other receivables and current assets	141,644	199,119
Taxes Receivable Related To Overpayments And Refunds [Member]
Other receivables and current assets	18,615	15,718
Prepaid Expenses and Other Current Assets [Member]
Other receivables and current assets	$ 23,424	$ 24,512

Details of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 73,630	$ 69,557	$ 206,666	$ 195,653
Weighted average shares outstanding - basic	84,774	86,959	85,132	87,570
Dilutive effect of stock plans	1,814	1,717	1,770	1,785
Weighted average shares outstanding - diluted	86,588	88,676	86,902	89,355
Basic earnings per share	$ 0.87	$ 0.80	$ 2.43	$ 2.23
Diluted earnings per share	$ 0.85	$ 0.78	$ 2.38	$ 2.19
Anti-dilutive shares	27	269	112	242

Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 648,006	$ 626,095
Amortized intangible assets, accumulated amortization	(493,367)	(453,833)
Indefinite-lived intangible assets (excluding goodwill)	357
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	357	357
Developed Software and Core Technologies
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	355,112	338,594
Amortized intangible assets, accumulated amortization	(291,960)	(275,130)
Customer Lists and Contract Backlog
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	164,548	159,549
Amortized intangible assets, accumulated amortization	(100,324)	(88,414)
Trade Names
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	128,346	127,952
Amortized intangible assets, accumulated amortization	$ (101,083)	$ (90,289)

Estimated Useful Lives (Detail)	9 Months Ended
Estimated Useful Lives (Detail)	Sep. 30, 2017
Minimum [Member] \| Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	3 years
Minimum [Member] \| Customer Lists and Contract Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	5 years
Minimum [Member] \| Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	2 years
Maximum [Member] \| Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	11 years
Maximum [Member] \| Customer Lists and Contract Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years
Maximum [Member] \| Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization	$ 12,264	$ 12,735	$ 36,398	$ 38,125

Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2017	$ 12,405
2018	37,466
2019	24,357
2020	23,396
2021	19,169
2022	14,202
Thereafter	23,644
Total intangible assets subject to amortization	154,639
Indefinite-lived intangible assets (excluding goodwill)	357
Other intangible assets, net	$ 154,996	$ 172,619

Changes in Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended
Changes in Goodwill (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Goodwill [Roll Forward]
Beginning balance	$ 1,337,215	$ 1,332,348
Acquisitions	11,719	0
Adjustments	0	(1)
Currency translation	4,510	1,184
Ending balance	$ 1,353,444	$ 1,333,531

Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 391,437	$ 333,975
Short-term investments	7,064	381
Deferred compensation plan investments	2,256	459
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	391,437	333,975
Short-term investments	0	0
Deferred compensation plan investments	2,256	459
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	7,064	381
Deferred compensation plan investments	0	0
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
Deferred compensation plan investments	$ 0	$ 0

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Fair Value Measurement - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments maturity	3 months
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments maturity	1 year

Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 275,585	$ 245,862	$ 792,914	$ 717,837
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	107,130	91,301	309,486	265,945
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	30,778	31,496	94,572	90,601
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	25,391	25,399	71,115	73,428
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,309	13,381	45,677	41,629
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	16,608	11,271	42,942	29,810
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,099	12,054	42,482	36,106
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	3,864	3,179	10,368	9,855
Other European
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	37,455	33,991	107,019	103,765
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 23,951	$ 23,790	$ 69,253	$ 66,698

Property and Equipment by Geographic Area (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 57,160	$ 54,677
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	45,521	43,810
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	5,193	4,753
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	3,685	3,033
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 2,761	$ 3,081

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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 14,773	$ 8,952	$ 39,408	$ 24,564
Related income tax benefits	(6,080)	(2,993)	(23,980)	(7,928)
Stock-based compensation expense, net of taxes	$ 8,693	$ 5,959	$ 15,428	$ 16,636
Basic earnings per share	$ (0.10)	$ (0.07)	$ (0.18)	$ (0.19)
Diluted earnings per share	$ (0.10)	$ (0.07)	$ (0.18)	$ (0.19)
Software Licenses
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 140	$ 187	$ 711	$ 524
Maintenance and Service
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	739	417	1,894	1,200
Selling, General and Administrative
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	8,782	4,292	23,310	11,160
Research and Development
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 5,112	$ 4,056	$ 13,493	$ 11,680

Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Income tax provision	$ 34,295	$ 31,436	$ 86,698	$ 86,596
Basic earnings per share	$ (0.10)	$ (0.07)	$ (0.18)	$ (0.19)
Diluted earnings per share	$ (0.10)	$ (0.07)	$ (0.18)	$ (0.19)
Adjustments for New Accounting Pronouncement [Member]
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Income tax provision	$ (1,400)		$ (11,500)
Basic earnings per share	$ 0.02		$ 0.13
Diluted earnings per share	$ 0.02		$ 0.13

Stock Repurchase Program (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Class of Stock Disclosures [Abstract]
Number of shares repurchased	2,000	2,700
Average price paid per share	$ 111.65	$ 90.11
Total cost	$ 223,291	$ 243,288

Stock Repurchase Program - Additional Information (Detail) shares in Millions	Sep. 30, 2017 shares
Class of Stock Disclosures [Abstract]
Stock repurchase program, repurchase authorization	5.0
Stock repurchase program, remaining number of shares authorized to be repurchased	3.5

Restructuring (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
Restructuring (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 331	$ 1,435	$ 6,176	$ 2,355	$ 10,297
Operating Income (Loss) [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 466	$ 2,000	$ 9,273	$ 3,419	$ 15,158

Restructuring - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 11.3
Restructuring charges, unpaid	$ 3.4

Contingencies and Commitments - Additional Information (Detail) $ in Millions	Sep. 30, 2017 USD ($)
India Service Tax Audit [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 7.1

New Accounting Guidance - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 34,295	$ 31,436	$ 86,698	$ 86,596
Net cash provided by operating activities			326,960	266,771
Net cash used in financing activities			(185,374)	(206,034)
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ (1,400)		$ (11,500)
Net cash provided by operating activities				6,200
Net cash used in financing activities				$ (6,200)