The Components of the Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 61,905	$ 49,763	$ 55,633
State	4,039	6,914	9,659
Foreign	7,287	(1,001)	7,582
Current income tax provision	73,231	55,676	72,874
Deferred:
Federal	25,059	20,808	13,286
State	(883)	3,381	2,306
Foreign	(413)	(2,831)	(276)
Deferred income tax provision	23,763	21,358	15,316
Provision for income taxes	$ 96,994	$ 77,034	$ 88,190