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Income Taxes - Provisions for Income Taxes and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 133 $ 174 $ 168 $ 374
Effective income tax rate 5.40% 7.80% 4.90% 17.00%