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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Net deferred income tax assets | $ 29,000,000.0 |  | $ 29,000,000.0 |  | $ 45,000,000.0 | $ 45,000,000.0
Foreign tax credit carryforwards | 16,000.0 |  | $ 16,000.0 |  |  |
Foreign tax credit carryforwards expiration year |  |  | 2022 |  |  |
Decrease in deferred tax assets valuation allowance | 16,000,000.0 |  |  |  |  |
Deferred tax assets valuation allowance | $ 29,000,000.0 |  | $ 29,000,000.0 |  | $ 45,000,000.0 |
Decrease in effective tax rate due to valuation allowance | 49.00% |  | 14.60% |  |  |
Net benefit effective tax rate impact associated with stock-based compensation and prior tax reserves |  |  | 0.60% |  |  |
Effective tax rate increased |  | 5.70% |  | 6.50% |  |
Decrease in effective tax rate |  | 2.40% |  | 4.80% |  |
Decrease in unrecognized tax positions | $ 1,400,000 |  | $ 1,400,000 |  |  |
Interest and penalties | $ 1,800,000 |  | $ 1,800,000 |  |  |

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