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Income Taxes - Income Tax Expense Reconciliation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income taxes computed at the federal statutory rate $ 158,741us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 146,544us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 96,277us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal income tax benefit 18,800us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 18,210us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3,226us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net (5,625)us-gaap_IncomeTaxReconciliationOtherAdjustments (12,535)us-gaap_IncomeTaxReconciliationOtherAdjustments (5,014)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total $ 171,916us-gaap_IncomeTaxExpenseBenefit $ 152,219us-gaap_IncomeTaxExpenseBenefit $ 94,489us-gaap_IncomeTaxExpenseBenefit