Components of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 57,106	$ 61,905	$ 49,763
State	8,449	4,039	6,914
Foreign	8,385	7,287	(1,001)
Current income tax provision	73,940	73,231	55,676
Deferred:
Federal	5,999	25,059	20,808
State	(610)	(883)	3,381
Foreign	(6,888)	(413)	(2,831)
Deferred income tax provision	(1,499)	23,763	21,358
Provision for income taxes	$ 72,441	$ 96,994	$ 77,034