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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |
Provisional income tax expense (benefit) |  | $ 103,700 | $ 128,200 |  |
Transition tax |  | 99,200 | 81,800 |  |
Provisional income tax benefit due to corporate rate reduction | $ 202,900 | 202,500 | $ 210,000 |  |
Unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries |  | 1,500,000 |  |  |
GILTI tax expense (benefit) |  | $ 10,200 |  |  |
Income tax expense at federal statutory rate, rate |  | 21.00% | 35.00% | 35.00% |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Valuation allowance |  | $ 90,366 | $ 59,349 |  |
Increase (decrease) in the total valuation allowance |  | 25,200 |  |  |
Net operating loss carryforwards for state income tax purposes |  | 552,400 |  |  |
Federal operating loss carry forwards |  | 68,900 |  |  |
Accrued interest and penalties related to the unrecognized tax benefits |  | 1,500 | 1,300 |  |
Total unrecognized tax benefits |  | 34,152 | $ 31,558 | $ 26,155 | $ 21,834
Deferred Tax Asset, Net Operating Loss Carryforward |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Valuation allowance |  | $ 416,700 |  |  |

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