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Taxation - Schedule of Current and Deferred Portions of 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 income tax expenses	$ 397us-gaap_CurrentIncomeTaxExpenseBenefit	$ 175us-gaap_CurrentIncomeTaxExpenseBenefit	$ 2,362us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax benefits	(1,856)us-gaap_DeferredIncomeTaxExpenseBenefit	(822)us-gaap_DeferredIncomeTaxExpenseBenefit	(123)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense / (benefit)	$ (1,459)us-gaap_IncomeTaxExpenseBenefit	$ (647)us-gaap_IncomeTaxExpenseBenefit	$ 2,239us-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.