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Income Taxes - Components of the Company's Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current taxes:
Federal	$ 28,258us-gaap_CurrentFederalTaxExpenseBenefit	$ 23,326us-gaap_CurrentFederalTaxExpenseBenefit	$ 24,928us-gaap_CurrentFederalTaxExpenseBenefit
State	2,709	3,682	2,865
Deferred taxes	(3,683)us-gaap_DeferredIncomeTaxExpenseBenefit	(483)us-gaap_DeferredIncomeTaxExpenseBenefit	(689)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income taxes	$ 27,284us-gaap_IncomeTaxExpenseBenefit	$ 26,525us-gaap_IncomeTaxExpenseBenefit	$ 27,104us-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 income tax expense (benefit) pertaining to income (loss) from continuing operations.