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Income Taxes - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) Provision | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Taxes [Line Items] |  |  |  |
Reduction in corporate tax rate |  | 21.00% | 35.00% | 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. |  |
Tax Cuts and Jobs Act of 2017, Accounting Complete [true false] |  | true | false |
Provisional decrease in deferred tax assets |  |  | $ 97,000,000 |
Provisional decrease in deferred tax liabilities |  |  | 127,000,000 |
Adjustment to deferred tax benefit |  |  | 30,000,000 |
Completion of 2017 tax return, Provisional increase in deferred tax assets | $ 1,000,000 | $ 1,000,000 |  |
Completion of 2017 tax return, Provisional decrease in deferred tax liabilities | 5,000,000 | 5,000,000 |  |
Completion of 2017 tax return, Adjustment to deferred tax benefit | 6,000,000 | 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 |  |
Income tax expense - BEAT |  | $ 0 |  |
Foreign pre-tax earnings |  | 84,000,000 | 70,000,000 | $ 58,000,000
Unremitted foreign earnings |  |  |  | 0
Qualified dividend received deduction |  | 148,000,000 |  |
Income tax benefits |  | $ (236,642,000) | $ (363,697,000) | $ (409,187,000)
Effective tax rates |  | 22.90% | 32.00% | 35.40%
Deferred federal and state tax benefit |  | $ 24,000,000 | $ 5,000,000 |
Provisional decrease in deferred tax assets liabilities net due to TCJA-17 |  |  | 30,000,000 |
Future taxable income, amount |  | 1,120,000,000 |  |
Deferred state tax benefit (net of the federal benefit) |  | (3,592,000) | 192,000 | $ (820,000)
Deferred foreign tax benefit | 7,000,000 | 7,000,000 |  |
Valuation allowances | 79,264,000 | 79,264,000 | 70,227,000 |
Increase in estimated liabilities for uncertain tax positions |  | 1,000,000 | 1,000,000 |
Impact of unrecognized tax benefits if recognized | 1,000,000 | $ 1,000,000 | 1,000,000 |
Period of expiration of the statute of limitations for certain jurisdictions |  | Within the next twelve months |  |
Jurisdictions statutes of limitations expiration period |  | 12 months |  |
Allowance in relation to state tax benefit |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowances |  |  | 75,000,000 | 66,000,000
Net Operating Losses |  |  |  |
Income Taxes [Line Items] |  |  |  |
Increase in valuation allowance |  | $ 9,000,000 |  |
Foreign Net Operating Losses and Credit Carryforwards |  |  |  |
Income Taxes [Line Items] |  |  |  |
Increase 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) |  | 75,000,000 |  |
Interest expense carryforwards | 78,000,000 | 78,000,000 |  |
Interest expense, deferred tax benefit | 4,000,000 | 4,000,000 |  |
Foreign Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating losses and credit | $ 30,000,000 | 30,000,000 |  |
ASU 2016-09 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Adjustment to deferred tax benefit |  |  | 30,000,000 |
Estimated transition tax obligations |  |  | 11,000,000 |
Income tax benefits |  | 1,000,000 | 22,000,000 |
Excess tax benefit from share based compensation |  |  |  | 45,200,000
Net favorable impact of the enactment of the TCJA-17 |  |  | 19,000,000 |
Unfavorable changes amount due to change in tax rate |  | 21,000,000 |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Provisional deferred tax - GILTI |  | $ 1,000,000 |  |
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 |  |

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