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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. federal tax statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal income tax benefit, Rate	2.81%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.06%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.47%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other, Rate	(0.05%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.14%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.15%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Annual effective tax expense, Total	37.76%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.62%us-gaap_EffectiveIncomeTaxRateContinuingOperations
U.S. federal tax statutory rate, Amount	$ 285,064us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 127,056us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 86,056us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal income tax benefit, Amount	22,901us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	7,469us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	6,068us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, Amount	(374)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	533us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	362us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Total income tax expense	$ 307,591us-gaap_IncomeTaxExpenseBenefit	$ 135,058us-gaap_IncomeTaxExpenseBenefit	$ 92,486us-gaap_IncomeTaxExpenseBenefit

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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