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Income Taxes - Provision for Income Taxes and Effective Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Provision for income taxes $ 139us-gaap_IncomeTaxExpenseBenefit $ 17us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate 3.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations