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Income Taxes - Summary of Components of Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal, Current									$ 167,745us-gaap_CurrentFederalTaxExpenseBenefit	$ 134,938us-gaap_CurrentFederalTaxExpenseBenefit	$ 111,940us-gaap_CurrentFederalTaxExpenseBenefit
Federal, Deferred									2,262	14,784	19,814
Federal income tax provision (benefit), Total									170,007	149,722	131,754
State, Current									21,109	17,037	13,980
State, Deferred									297	1,136	1,530
State income tax provision (benefit), Total									21,406	18,173	15,510
Income tax provision (benefit), Total	$ 50,594us-gaap_IncomeTaxExpenseBenefit	$ 51,174us-gaap_IncomeTaxExpenseBenefit	$ 48,944us-gaap_IncomeTaxExpenseBenefit	$ 40,701us-gaap_IncomeTaxExpenseBenefit	$ 44,423us-gaap_IncomeTaxExpenseBenefit	$ 45,198us-gaap_IncomeTaxExpenseBenefit	$ 42,876us-gaap_IncomeTaxExpenseBenefit	$ 35,398us-gaap_IncomeTaxExpenseBenefit	$ 191,413us-gaap_IncomeTaxExpenseBenefit	$ 167,895us-gaap_IncomeTaxExpenseBenefit	$ 147,264us-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.