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Components of Current and Deferred Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current income tax	$ 4,467us-gaap_CurrentIncomeTaxExpenseBenefit	$ 2,089us-gaap_CurrentIncomeTaxExpenseBenefit	$ 233us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax	45us-gaap_DeferredIncomeTaxExpenseBenefit	(769)us-gaap_DeferredIncomeTaxExpenseBenefit	(458)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit)	$ 4,512us-gaap_IncomeTaxExpenseBenefit	$ 1,320us-gaap_IncomeTaxExpenseBenefit	$ (225)us-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.