ANSYS (ANSS) 10-Q 7 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document Documentand Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
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

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
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_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	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

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	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

Organization	9 Months Ended
	Sep. 30, 2013
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, 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

Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies	'
	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:
		30-Sep-13			31-Dec-12
	(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

Acquisitions	9 Months Ended
	Sep. 30, 2013
Acquisitions	'
	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.

Other_Current_Assets

Other Current Assets	9 Months Ended
	Sep. 30, 2013
Other Current Assets	'
	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

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

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share	'
	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,		September 30,		September 30,		September 30,
		2013		2012		2013		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

LongTerm_Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2013
Long-Term Debt	'
	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
		30-Sep-13				30-Sep-12
	(in thousands)	Interest		Amortization		Interest		Amortization
		Expense				Expense
	July 31, 2008 term loan	$	22	$	4	$	329	$	172
		Nine Months Ended
		30-Sep-13				30-Sep-12
	(in thousands)	Interest		Amortization		Interest		Amortization
		Expense				Expense
	July 31, 2008 term loan	$	230	$	149	$	1,117	$	565

Goodwill_and_Intangible_Assets

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:
		30-Sep-13						31-Dec-12
	(dollars in thousands)	Gross			Accumulated			Gross		Accumulated
		Carrying			Amortization			Carrying		Amortization
		Amount						Amount
	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

Fair_Value_Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2013
Fair Value Measurement	'
	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,			Quoted Prices in			Significant Other			Significant
		2013			Active Markets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(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)	31-Dec-12			Quoted Prices in			Significant Other			Significant
					Active Markets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(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			Deferred
		Consideration			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			Deferred
		Consideration			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

Geographic Information	9 Months Ended
	Sep. 30, 2013
Geographic Information	'
	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,		September 30,		September 30,		September 30,
		2013		2012		2013		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,		December 31,
		2013		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

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.

Stockbased_Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2013
Stock-based Compensation	'
	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,			September 30,			September 30,			September 30,
		2013			2012			2013			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

Contingencies and Commitments	9 Months Ended
	Sep. 30, 2013
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 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.

SaleLeaseback_Arrangement_Note

Sale-Leaseback Arrangement (Notes)	9 Months Ended
	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

New Accounting Guidance	9 Months Ended
	Sep. 30, 2013
New Accounting Guidance	'
	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.

Accounting_Policies_Policies

Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Basis of Presentation	'
	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
	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:
		30-Sep-13			31-Dec-12
	(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.

Accounting_Policies_Tables

Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2013
Cash and Cash Equivalents	'
	The Company’s cash and cash equivalent balances comprise the following:
		30-Sep-13			31-Dec-12
	(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

Acquisitions (Tables) (Esterel Technologies Societe Anonyme [Member])	9 Months Ended
	Sep. 30, 2013
Esterel Technologies Societe Anonyme [Member]	'
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

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,		September 30,		September 30,		September 30,
		2013		2012		2013		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

LongTerm_Debt_Tables

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
		30-Sep-13				30-Sep-12
	(in thousands)	Interest		Amortization		Interest		Amortization
		Expense				Expense
	July 31, 2008 term loan	$	22	$	4	$	329	$	172
		Nine Months Ended
		30-Sep-13				30-Sep-12
	(in thousands)	Interest		Amortization		Interest		Amortization
		Expense				Expense
	July 31, 2008 term loan	$	230	$	149	$	1,117	$	565

Goodwill_and_Intangible_Assets1

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:
		30-Sep-13						31-Dec-12
	(dollars in thousands)	Gross			Accumulated			Gross		Accumulated
		Carrying			Amortization			Carrying		Amortization
		Amount						Amount
	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

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,			Quoted Prices in			Significant Other			Significant
		2013			Active Markets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(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)	31-Dec-12			Quoted Prices in			Significant Other			Significant
					Active Markets			Observable			Unobservable
					(Level 1)			Inputs			Inputs
								(Level 2)			(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	'
	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			Deferred
		Consideration			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			Deferred
		Consideration			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

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,		September 30,		September 30,		September 30,
		2013		2012		2013		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,		December 31,
		2013		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

Stockbased_Compensation_Tables

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,			September 30,			September 30,			September 30,
		2013			2012			2013			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_Inform

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

Cash_and_Cash_Equivalents_Deta

Cash and Cash Equivalents (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
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_C

Accounting Policies Cash and Cash Equivalents (Parenthetical) (Details) (Cash and Cash Equivalents [Member], Money Market Funds [Member])	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_Informa

Acquisition - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Aug. 01, 2012	Apr. 03, 2013	Aug. 01, 2012	Sep. 30, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified				EVEN-Evolutionary Engineering Aktiengesellschaft [Member]	Esterel Technologies Societe Anonyme [Member]	Esterel Technologies Societe Anonyme [Member]	Esterel Technologies Societe Anonyme [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Business Combination, Consideration Transferred	'	'	'	$8,100	$58,150	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	'	'	'	'	13,075	'	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	'	'	4,500	'	'	'
Business acquisition, acquisition percentage	'	'	'	100.00%	100.00%	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	'	'	'	'	1,139	'	'
Business Combination, Contingent Consideration, Liability	'	'	'	3,597	'	'	'
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
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	'	'	2,600	'	'	'
Goodwill	1,255,275	1,251,247	'	5,936	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	'	'	$10,000	'	($7,096)	'	'

Recognized_Amounts_of_Identifi

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Aug. 01, 2012	Aug. 01, 2012	Aug. 01, 2012	Aug. 01, 2012	Aug. 01, 2012
In Thousands, unless otherwise specified				Esterel Technologies Societe Anonyme [Member]	Esterel Technologies Societe Anonyme [Member]	Esterel Technologies Societe Anonyme [Member]	Platform Trade Names [Member]
					Developed Software	Customer Relationships	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	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	'	'	'	'	10,717	21,421	2,695
Accounts payable and other liabilities	'	'	'	-4,707	'	'	'
Deferred revenue	'	'	'	-1,139	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	'	'	10,000	-7,096	'	'	'
Total identifiable net assets	'	'	'	39,703	'	'	'
Goodwill	$1,255,275	$1,251,247	'	$18,447	'	'	'

Recognized_Amounts_of_Identifi1

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_Additiona

Other Current Assets - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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_Additi

Uncertain Tax Positions - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Tax Contingency [Line Items]	'	'
Unrecognized Tax Benefits Accrued Including Income Tax Penalties And Interest	$36.50	$37
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$17.20	'

Details_of_Basic_and_Diluted_E

Details of Basic and Diluted EPS (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	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_

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

Intangible_Assets_and_Estimate

Intangible Assets and Estimated Useful Lives (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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_Estimate1

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_Assets2

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Line Items]	'	'	'	'
Amortization expense for intangible assets	$14.80	$17	$46.40	$50.60

Estimated_Future_Amortization_

Estimated Future Amortization Expense for Intangible Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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

Changes in Goodwill (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Apr. 03, 2013
		EVEN-Evolutionary Engineering Aktiengesellschaft [Member]
Goodwill [Line Items]	'	'
Beginning balance	$1,251,247	$5,936
Currency translation and other	-1,908	'
Ending balance	$1,255,275	$5,936

Fair_Value_of_Assets_and_Liabi

Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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_Additio

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

Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) (Significant Unobservable Inputs (Level 3), USD $)	3 Months Ended
In Thousands, unless otherwise specified	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_Det

Revenue by Geographic Area (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	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_Geog

Property and Equipment by Geographic Area (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
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_Addit

Stock Repurchase Program - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, except Share data in Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Stock Repurchase Program [Line Items]	'	'
Treasury Stock, Shares, Acquired	1	1
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	'

StockBased_Compensation_Expens

Stock-Based Compensation Expense, and its net Impact on Basic and Diluted Earnings per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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_

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

SaleLeaseback_Arrangement_Deta

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