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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Income tax effective rate | 14.40% | 11.50% | (43.10%) | 300.30%
Internal Revenue Service [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Income tax benefit |  |  | $ 0.3 |
Minimum [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Decrease in unrecognized tax benefits | $ 1.0 |  | 1.0 |
Maximum [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Decrease in unrecognized tax benefits | $ 1.5 |  | $ 1.5 |

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