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Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]
Current	$ 15,630us-gaap_CurrentIncomeTaxExpenseBenefit	$ 8,591us-gaap_CurrentIncomeTaxExpenseBenefit	$ 5,534us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	471us-gaap_DeferredIncomeTaxExpenseBenefit	1,181us-gaap_DeferredIncomeTaxExpenseBenefit	1,582us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense	$ 16,101us-gaap_IncomeTaxExpenseBenefit	$ 9,772us-gaap_IncomeTaxExpenseBenefit	$ 7,116us-gaap_IncomeTaxExpenseBenefit

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

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