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	$ 103,332us-gaap_CurrentFederalTaxExpenseBenefit	$ 73,243us-gaap_CurrentFederalTaxExpenseBenefit	$ 65,099us-gaap_CurrentFederalTaxExpenseBenefit
State	17,972	12,993	10,655
Current income tax expense (benefit), total	121,304us-gaap_CurrentIncomeTaxExpenseBenefit	86,236us-gaap_CurrentIncomeTaxExpenseBenefit	75,754us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	27,646	35,797	24,795
State	3,385	2,883	4,894
Deferred income tax expense (benefit), total	31,031us-gaap_DeferredIncomeTaxExpenseBenefit	38,680us-gaap_DeferredIncomeTaxExpenseBenefit	29,689us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	$ 152,335us-gaap_IncomeTaxExpenseBenefit	$ 124,916us-gaap_IncomeTaxExpenseBenefit	$ 105,443us-gaap_IncomeTaxExpenseBenefit

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

Amount of current income tax expense (benefit) pertaining to taxable 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 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.