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				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Cash Flow Hedges [Member]
Derivative [Line Items]
Net gain (loss) recognized in OCI, net of tax	$ (3,359)	[1]	$ (3,454)	[1]	$ (1,056)	[1]	$ (1,851)	[1]
Gain (loss) reclassified from accumulated OCI into royalty revenue, net of tax	(32)	[2]	(328)	[2]	(1,011)	[2]	(998)	[2]
Net gain (loss) recognized in interest and other income, net	4	[3]	(27)	[3]	9	[3]	(54)	[3]
Amount excluded from effectiveness testing	0		0		0		0
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Net gain (loss) recognized in interest and other income, net	$ 0		$ 391		$ 0		$ 391

[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 ($4) and $27 for the three months ended September 30, 2013 and 2012, respectively, and ($9) and $27 for the nine months ended September 30, 2013 and 2012, respectively. Net loss from restructuring hedges was zero for the three months ended September 30, 2013 and 2012, and zero and $27 for the nine months ended September 30, 2013 and 2012, respectively.