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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components Of Income Tax Expense Benefit [Line Items]          
Income tax effective rate 181.40%   54.20% 107.90% 51.30%
Income taxes $ 1,219   $ 1,096 $ (4,787) $ 6,469
Internal Revenue Service [Member]          
Components Of Income Tax Expense Benefit [Line Items]          
Income taxes   $ (1,800)      
Minimum [Member]          
Components Of Income Tax Expense Benefit [Line Items]          
Decrease in unrecognized tax benefits 13,000     13,000  
Maximum [Member]          
Components Of Income Tax Expense Benefit [Line Items]          
Decrease in unrecognized tax benefits $ 13,400     $ 13,400