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Income Taxes - (Benefit) Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
(Benefit) provision for income taxes $ (99) $ 22
Effective income tax rate (9.40%) 0.40%