Acquisition - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2013	Aug. 01, 2012	Apr. 03, 2013 EVEN-Evolutionary Engineering Aktiengesellschaft [Member]	Jun. 30, 2013 Esterel Technologies Societe Anonyme [Member]	Jun. 30, 2013 Esterel Technologies Societe Anonyme [Member]	Aug. 01, 2012 Esterel Technologies Societe Anonyme [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price			$ 8,100			$ 58,150
Business Acquisition, Cost of Acquired Entity, Cash Paid			4,500
Business acquisition, acquisition percentage			100.00%			100.00%
Business acquisition, cash on subsidiary balance sheet						13,075
Contingent consideration			3,597
Acquired deferred revenue						1,139
Acquired deferred revenue, amount lower than the historical carrying value recorded on the opening balance sheet						(10,973)
Business Acquisition Write Down Of Deferred Revenue Impact On Reported Revenue				1,235	2,874
Acquired deferred revenue, expected impact on reported revenue in next quarter				657	657
Business combination, goodwill recognized, description	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.
Net deferred tax liabilities		10,000				(7,104)
Amortizable intangible assets			2,600
Goodwill			5,959			18,684
Business Acquisition Write Down Of Deferred Revenue Expected Impact On Revenue Next Fiscal Year				$ 4,096	$ 4,096