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Income Taxes - Additional Information (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]        
Income tax expense $ (589) $ (2,091) $ (344) $ 245
Effective income tax rate (2.70%) (12.70%) (0.70%) 0.40%