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Income Taxes - Summary of Provision for Income Taxes and Effective Tax Rate from Continuing Operations (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]        
Pretax income (loss) $ 5,095 $ (479) $ 24,901 $ 23,990
Provision for income taxes $ 1,597 $ 21 $ 11,143 $ 8,776
Effective rate 31.30% 4.40% 44.70% 36.60%