Foreign Currency Hedging (Schedule of Effect of Derivative Instruments in Consolidated Statements of Income and Consolidated Statements of Comprehensive Income) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative [Line Items]
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net		$ 0	$ (2)	$ 0	$ (5)
Cash Flow Hedges [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI, net of tax	[1]	(57)	1,974	4,306	2,305
Gain (loss) reclassified from accumulated OCI into royalty revenue, net of tax	[2]	1,495	(989)	3,903	(3,744)
Net gain (loss) recognized in interest and other income, net	[3]	$ 0	$ 2	$ 0	$ 5

[1] hange in the fair value of cash flow hedges, net of tax.

[2] Effective portion classified as royalty revenue.

[3] Ineffectiveness from excess hedge was approximately zero and ($2) for the three months ended September 30, 2015 and 2014, respectively, and zero and ($5) for the nine months ended September 30, 2015 and 2014, respectively.