Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Detail)	1 Months Ended				0 Months Ended
	Aug. 01, 2011 Apache Design Solutions, Inc. Developed Software	Aug. 01, 2011 Apache Design Solutions, Inc. Customer Relationships	Aug. 01, 2011 Apache Design Solutions, Inc. Contract Backlog	Aug. 01, 2011 Apache Design Solutions, Inc. Apache Trade Name	Aug. 01, 2012 Esterel Technologies, S.A. Developed Software	Aug. 01, 2012 Esterel Technologies, S.A. Customer Relationships
Business Combination, Separately Recognized Transactions [Line Items]
Useful life of intangible assets acquired, in years	7 years	15 years	3 years	6 years	10 years	12 years