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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Mar. 27, 2020 | Dec. 31, 2019
Effective tax rate | 50.10% | 15.70% | 21.20% | 7.50% |  |  |
U.S. Federal income tax rate |  |  | 21.00% |  |  |  |
Deferred tax assets, valuation allowance | $ 3 |  | $ 3 |  |  |  |
Operating loss carryforwards limitations |  |  | The foreign net operating losses have carryback periods of three years, carryforward periods of twenty years and begin to expire in 2034. |  |  |  |
Unrecognized tax benefits | 2 |  | $ 2 |  |  |  | $ 4
Income tax penalties and interest accrued | 1 |  | 1 |  |  |  | $ 1
Income tax interest expense | 0 | $ 0 | $ 0 | $ 0 |  |  |
Interest deduction percentage |  |  | 30.00% | 50.00% |  |  |
Forecast [Member] |  |  |  |  |  |  |
Effective income tax rate reconciliation, unrecognized tax benefits |  |  |  |  | $ 1 |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |
Operating loss carryforwards | $ 228 |  | $ 228 |  |  |  |
Operating loss carryforwards limitations |  |  | The federal net operating losses have carryback periods of five years that can offset 100% of taxable income for periods in which the Company was a “C” Corporation and can be carried forward indefinitely. The carryforwards will be able to offset 80% of future taxable income for years beginning after 2020. |  |  |  |
Operating loss carryback term |  |  | 5 years |  |  |  |
Operating loss carryforwards offset percentage | 80.00% |  | 80.00% |  |  | 100.00% | 100.00%
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Operating loss carryforwards | $ 0 |  | $ 0 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |
Operating loss carryforwards | $ 5 |  | $ 5 |  |  |  |
Operating loss carryback term |  |  | 3 years |  |  |  |
Operating loss carryforwards, carryback term |  |  | 20 years |  |  |  |
Operating loss carryforwards expiration year |  |  | 2034 |  |  |  |

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