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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Components Of Income Tax Expense Benefit [Line Items] |  |
Income tax effective rate | 117.60% | 50.70%
Income tax (benefit) | $ (6,006) | $ 5,373
Internal Revenue Service [Member] |  |
Components Of Income Tax Expense Benefit [Line Items] |  |
Income tax (benefit) | (1,800) |
Minimum [Member] |  |
Components Of Income Tax Expense Benefit [Line Items] |  |
Decrease in unrecognized tax benefits | 13,000 |
Maximum [Member] |  |
Components Of Income Tax Expense Benefit [Line Items] |  |
Decrease in unrecognized tax benefits | $ 13,400 |

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