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Income Taxes - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) Provision | Dec. 31, 2017 USD ($) | Dec. 21, 2017 USD ($)
Income Taxes [Line Items] |  |  |  |  |  |
Reduction in corporate tax rate |  | 21.00% | 21.00% | 21.00% | 35.00% |
Tax code changes description |  | The TCJA-17 made broad and complex changes to the U.S. tax code, including, but not limited to, (1) reducing the U.S. federal corporate tax rate from 35 percent to 21 percent; (2) requiring companies to pay a one-time transition tax on certain unrepatriated earnings of foreign subsidiaries; (3) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries; (4) requiring a current inclusion in U.S. federal taxable income of certain earnings of controlled foreign corporations through the implementation of a territorial tax system; (5) creating a new limitation on deductible interest expense; and (6) limiting certain other deductions. |  |  |  |
Provisional decrease in deferred tax assets |  |  |  |  | $ 97,000,000 |
Provisional decrease in deferred tax liabilities |  |  |  |  | 127,000,000 |
Net adjustment to deferred tax benefit |  |  |  |  | 30,000,000 |
Completion of 2017 tax return, increase in deferred tax assets | $ 1,000,000 |  |  |  |  |
Completion of 2017 tax return, decrease in deferred tax liabilities | 5,000,000 |  |  |  |  |
Completion of 2017 tax return, Adjustment to deferred tax benefit | 6,000,000 |  |  |  |  |
Estimated transition tax obligations |  |  |  |  | $ 11,300,000 |
Increase in transition tax |  |  |  | $ 100,000 |  |
TCJA 2017, completion of accounting, estimated transition tax obligations |  |  |  | $ 11,400,000 |  |
Number of anti-base erosion tax provisions | Provision |  |  |  | 2 |  |
Provisional deferred tax - GILTI |  | $ 0 | $ 0 |  |  |
Foreign pre-tax earnings |  | 72,000,000 | 69,000,000 | $ 84,000,000 |  |
Unremitted foreign earnings |  |  |  |  |  | $ 0
Qualified dividend received deduction |  | 110,000,000 |  |  |  |
Tax expense (benefit) from employee share-based payments |  | $ 7,000,000 | $ (12,000,000) | $ (1,000,000) |  |
Effective tax rates |  | 23.90% | 22.40% | 22.90% |  |
Deferred federal state and foreign tax benefit |  | $ 11,000,000 | $ 8,000,000 |  |  |
Future taxable income, amount |  | 951,000,000,000 |  |  |  |
Deferred state tax benefit (net of the federal benefit) |  | (4,114,000) | (11,106,000) | $ (3,592,000) |  |
Deferred foreign tax benefit |  | 10,000,000 |  |  |  |
Valuation allowances |  | 68,003,000 | 75,277,000 |  |  |
Increase in estimated liabilities for uncertain tax positions |  | 1,000,000 | 1,000,000 |  |  |
Impact of unrecognized tax benefits if recognized |  | $ 2,000,000 | 2,000,000 |  |  |
Period of expiration of the statute of limitations for certain jurisdictions |  | within the next twelve months |  |  |  |
Jurisdictions statutes of limitations expiration period |  | 12 months |  |  |  |
Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Accrued interest and penalties |  | $ 1,000,000 | 1,000,000 |  |  |
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years |  | 4 years |  |  |  |
Minimum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years |  | 3 years |  |  |  |
Allowance in relation to state tax benefit |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation allowances | $ 71,000,000 |  | 64,000,000 | $ 71,000,000 |  |
Net Operating Losses Not Realized |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Decrease in valuation allowance |  | $ 7,000,000 |  |  |  |
Foreign Net Operating Losses and Credit Carryforwards |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Decrease in valuation allowance |  | 4,000,000 | $ 4,000,000 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred state tax benefit (net of the federal benefit) |  | 66,000,000 |  |  |  |
Interest expense carryforwards |  | 141,000,000 |  |  |  |
Interest expense, deferred tax benefit |  | 5,000,000 |  |  |  |
Foreign Tax Authority |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Net operating losses and interest expense |  | $ 45,000,000 |  |  |  |

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