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Income Taxes - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 USD ($) Provision | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Taxes [Line Items] |  |  |  |
Reduction in corporate tax rate |  | 35.00% | 35.00% | 35.00%
Tax code changes description |  | The TCJA-17 makes 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; and (5) creating a new limitation on deductible interest expense. |  |
Tax Cuts and Jobs Act of 2017, Accounting Complete [true false] |  | 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 |  |
Estimated transition tax obligations |  | $ 11,300,000 |  |
Number of anti-base erosion tax provisions | Provision |  | 2 |  |
Provisional deferred tax - GILTI |  | $ 0 |  |
Income tax expense - BEAT |  | 0 |  |
Foreign pre-tax earnings |  | 70,000,000 | $ 58,000,000 | $ 41,000,000
Unremitted foreign earnings |  |  | 0 | 0
Accrued tax provision |  | 11,300,000 |  |
Income tax benefits |  | $ (363,697,000) | $ (409,187,000) | $ (395,203,000)
Effective tax rates |  | 32.00% | 35.40% | 34.50%
Effective tax rates including income attributable to noncontrolling interests |  | 32.60% | 36.80% | 36.70%
Deferred federal and state tax benefit |  | $ 5,000,000 | $ 10,000,000 |
Provisional decrease in deferred tax assets due to TCJA-17 |  | 97,000,000 |  |
Provisional decrease in deferred tax assets liabilities net due to TCJA-17 |  | 30,000,000 |  |
Future taxable income, amount |  | 1,090,000,000 |  |
Deferred state tax benefit (net of the federal benefit) |  | 192,000 | (820,000) | $ (302,000)
Deferred foreign tax benefit |  | 6,000,000 |  |
Valuation allowances |  | 70,227,000 | 56,333,000 |
Reduction of the federal benefit due to the change in U.S. corporate income tax rates |  | 12,000,000 |  |
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 |
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 |  | $ 66,000,000 | 52,000,000 |
Net Operating Losses |  |  |  |
Income Taxes [Line Items] |  |  |  |
Increase in valuation allowance |  | 2,000,000 |  |
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) |  | 70,000,000 |  |
Foreign Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating losses and credit |  | 26,000,000 |  |
ASU 2016-09 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax benefits |  | $ 22,000,000 |  |
Excess tax benefit from share based compensation |  |  | $ 45,200,000 | $ 47,400,000
Scenario, Forecast |  |  |  |
Income Taxes [Line Items] |  |  |  |
Reduction in corporate tax rate | 21.00% |  |  |

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