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Income Taxes - Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 148,221us-gaap_CurrentFederalTaxExpenseBenefit	$ 137,675us-gaap_CurrentFederalTaxExpenseBenefit	$ 76,599us-gaap_CurrentFederalTaxExpenseBenefit
State	28,881	30,352	3,066
Deferred:
Federal	(4,451)	(13,402)	13,086
State	(735)	(2,406)	1,738
Total	$ 171,916us-gaap_IncomeTaxExpenseBenefit	$ 152,219us-gaap_IncomeTaxExpenseBenefit	$ 94,489us-gaap_IncomeTaxExpenseBenefit

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.