Comprehensive Income or Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Comprehensive Income (Loss) [Line Items]
Net income (loss)	$ 6,455	$ 12,128	$ 4,646	$ 21,563
Foreign currency translation adjustments	(10,857)	6,298	(4,886)	21,262
Unrealized gain (loss) on marketable securities, net of tax		420	1,168	501
Unrealized gain (loss) on derivative instruments, net of tax	(43)		212
Total comprehensive income (loss)	$ (4,445)	$ 18,846	$ 1,140	$ 43,326