Income Taxes Charged to Earnings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 64,328	$ 228,683	$ 43,839
Foreign	1,554	1,825	1,122
State	10,553	35,028	10,175
Total current taxes	76,435	265,536	55,136
Deferred:
Federal	(6,834)	(19,647)	(7,009)
Foreign	223	1,743	410
State	(3,510)	(382)	(4,362)
Total deferred taxes	(10,121)	(18,286)	(10,961)
Income tax expense	$ 66,314	$ 247,250	$ 44,175