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Income Taxes Components of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current provision:
Federal									$ 99,480	$ 87,635	$ 86,220
State									25,498	23,752	25,505
Deferred expense (benefit):
Federal									11,244	2,385	5,756
State									2,836	(503)	1,606
Income tax expense	$ (35,285)	$ (47,404)	$ (29,968)	$ (26,401)	$ (29,526)	$ (28,470)	$ (31,517)	$ (23,756)	$ 139,058	$ 113,269	$ 119,087

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.