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Income Taxes - Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 371 $ 133 $ 539 $ 168
Effective income tax rate 90.70% 5.40% 65.60% 4.90%