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Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax expense at federal rate of 35%									$ 32,606	$ 22,844	$ 22,510
State income taxes, net of federal benefit									675	655	1,475
Change in valuation allowance									(1,615)	(2,680)	251
Foreign tax rate differential									(4,650)	(8,940)	(1,572)
Unrecognized tax benefit increase (decrease)									488	(1,665)	(1,882)
Effect of intellectual property transfer											(2,100)
Tax effect of foreign operations									5,906	5,311	373
Acquisition Costs									896	2,659
Tax benefit of research & development									(4,001)	(1,749)
Other									(1,014)	(13)	(594)
Income tax provision	$ 24,108	$ 5,347	$ 2,280	$ (2,444)	$ 24,347	$ (1,175)	$ (6,195)	$ (555)	$ 29,291	$ 16,422	$ 18,461

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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