Foreign Currency Hedging (Schedule of Effect of Derivative Instruments in Consolidated Statements of Income and Consolidated Statements of Comprehensive Income) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Derivative [Line Items]
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	$ (1)		$ (2)		$ (3)		$ (5)
Cash Flow Hedges [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI, net of tax	264	[1]	(1,265)	[1]	331	[1]	2,303	[1]
Gain (loss) reclassified from accumulated OCI into royalty revenue, net of tax	(2,027)	[2]	268	[2]	(2,755)	[2]	(979)	[2]
Net gain (loss) recognized in interest and other income, net	$ 1	[3]	$ 2	[3]	$ 3	[3]	$ 5	[3]

[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 ($1) and ($2) for the three months ended June 30, 2014 and 2013, respectively, and $(3) and ($5) for the six months ended June 30, 2014, and 2013, respectively.