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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jan. 01, 2018
Income Taxes [Line Items] |  |  |  |  |  |
Effective income tax rate | 23.70% | 34.00% | 23.30% | 34.40% |  |
Reduction in corporate tax rate |  |  | 21.00% |  | 35.00% |
Tax code changes description |  |  | The TCJA-17 enacted on December 22, 2017 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% to 21%; (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. |  |  |
Income tax benefits | $ (54,186,000) | $ (74,992,000) | $ (192,814,000) | $ (286,774,000) | $ 30,000,000 |
Estimated transition tax obligations |  |  |  |  | $ 11,300,000 |
Provisional deferred tax - GILTI |  |  | $ 0 |  |  |
Unrecognized tax benefits |  |  |  |  |  | $ 1,000,000
Impact of unrecognized tax benefits if recognized |  |  |  |  |  | $ 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 |  |  |
ASU 2016-09 |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Unfavorable changes amount due to change in tax rate | 1,000,000 |  | $ 8,000,000 |  |  |
Increase (decrease) in provision for income taxes |  |  | $ (1,000,000) | $ (9,000,000) |  |
ASU 2016-09 | Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Increase (decrease) in provision for income taxes | $ 1,000,000 | $ 1,000,000 |  |  |  |

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