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Income Taxes - Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 113 $ 363 $ 539 $ 497
Effective income tax rate 4.20% 4.40% 7.30% 4.00%