Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]
Federal, Current	$ 99,354	$ 48,068	$ 18,085
State, Current	24,339	11,969	7,412
Foreign, Current	25,603	23,101	16,232
Federal and state, Deferred	(15,188)	15,117	3,654
Foreign, Deferred	195	2,039	3,716
Provision (benefit) for income taxes	$ 134,303	$ 100,294	$ 49,099