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Income Taxes - Deferred Income Tax Assets and Liabilities on Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets, Net, Classification [Abstract]
Current deferred income tax assets	$ 1,267us-gaap_DeferredTaxAssetsNetCurrent
Long term deferred income tax liabilities	(1,860)us-gaap_DeferredTaxLiabilities	(267)us-gaap_DeferredTaxLiabilities
Net deferred tax liability	$ (593)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (267)us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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