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Income Taxes - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |
Provision for (benefit from) income taxes |  | $ 66,314 | $ 664,510 | $ 70,571 | $ 614,402 |  |  |
Net discrete tax (expense) benefit |  | (42,100) | (561,500) | (44,300) | (558,800) |  |  |
Tax expense related to deemed repatriation of accumulated foreign earnings |  | 9,300 |  |  |  |  |  |
Tax expense related to indefinite reinvestment assertion |  | 14,600 |  |  |  |  |  |
Tax expense related to reassessments of prior year tax liabilities |  | 17,800 |  |  |  |  |  |
Gross tax related to the Tax Act | $ 268,500 |  |  |  |  |  |  |
Release of valuation allowance related to the Tax Act | 259,200 |  |  |  |  |  |  |
Prior year foreign earnings that will not be indefinitely reinvested | 300,000 | 300,000 |  | 300,000 |  |  |  |
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months |  |  |  |  |  | $ 3,500 |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Cumulative effect recognized on initial application of the new guidance | $ 1,614,343 | $ 1,614,343 | $ 2,460,224 | $ 1,614,343 | $ 2,460,224 |  |  | $ 2,179,358
Accounting Standards Update 2016-16 |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Cumulative effect recognized on initial application of the new guidance |  |  |  |  |  |  | $ 9,000 |

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