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Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current federal income tax	$ 29,832us-gaap_CurrentFederalTaxExpenseBenefit	$ 24,931us-gaap_CurrentFederalTaxExpenseBenefit	$ 23,605us-gaap_CurrentFederalTaxExpenseBenefit
Current state income tax	94	15	13
Deferred federal income tax expense (benefit)	(893)	754	1,517
Income tax expense	$ 29,033us-gaap_IncomeTaxExpenseBenefit	$ 25,700us-gaap_IncomeTaxExpenseBenefit	$ 25,135us-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.