Foreign Currency Hedging (Schedule of Effect of Derivative Instruments in Consolidated Statements of Income and Consolidated Statements of Comprehensive Income) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Net gain (loss) recognized in OCI, net of tax	[1]	$ 4,626	$ 4,834	$ (2,432)
Gain (loss) reclassified from accumulated OCI into royalty revenue, net of tax	[2]	5,390	(3,768)	(1,510)
Cash Flow Hedges [Member]
Derivative [Line Items]
Net gain (loss) recognized in interest and other income, net	[3]	$ 0	$ 5	$ 11

[1] Net change in the fair value of the effective portion of cash flow hedges classified in OCI

[2] Effective portion classified as royalty revenue

[3] Ineffectiveness from excess hedge was approximately $0, ($5) and ($11) for the years ended December 31, 2015, 2014 and 2013, respectively.