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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Income tax effective rate | 50.90% |  | 8.80% | 28.40% | 56.30%
Income taxes | $ 13,656 |  | $ (117) | $ 8,869 | $ 6,352
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 |

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