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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]        
Provision (benefit) for income taxes $ 651 $ 266 $ (249) $ 805
Effective income tax rate 10.10% 4.30% (3.80%) 5.90%