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Current and Deferred Components 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 tax
Deferred tax		1,378us-gaap_DeferredIncomeTaxExpenseBenefit	(2,501)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (expense) credit		$ 1,378us-gaap_IncomeTaxExpenseBenefit	$ (2,501)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.