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	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Foreign Currency Hedging [Abstract]
Net gain (loss) recognized in OCI, net of tax	$ (5,040)	[1]	$ (4,470)	[1]	$ 5,134	[1]
Gain (loss) reclassified from accumulated OCI into royalty revenue, net of tax	(1,859)	[2]	664	[2]	1,914	[2]
Amount excluded from effectiveness testing	0		0		0
Cash Flow Hedges [Member]
Derivative [Line Items]
Gain (loss) recognized in interest and other income, net	(169)	[3]	(19)	[3]	0	[3]
Non-designated Contracts [Member]
Derivative [Line Items]
Gain (loss) recognized in interest and other income, net	$ 391	[4]	$ 0	[4]	$ 0	[4]

[1] Net change in the fair value of the effective portion of cash flow hedges classified in other comprehensive income (loss)(OCI)

[2] Effective portion classified as royalty revenue

[3] Ineffectiveness from excess hedge was approximately $8,000 and net loss from restructuring hedges was approximately $161,000, net classified as interest and other income, net

[4] Gain on de-designation classified as interest and other income, net