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Income Taxes - Narrative (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
Loss carryforwards |  | $ 694,591 |  |  |
Tax credit carryforwards |  | 71,409 |  |  |
Deferred tax assets, valuation allowance |  | 631,914 | $ 610,560 |  |
Unrecognized tax benefits, end of period | $ 119,818 | 140,309 | 137,929 | $ 119,818 | $ 116,070
Amount of unrecognized tax benefits that would impact the effective tax rate if recognized |  | 63,200 |  |  |
Amount of unrecognized tax benefits that would impact the effective tax rate if recognized and increase the valuation allowance |  | 77,100 |  |  |
Increase (decrease) in recognized interest and penalties related to unrecognized tax benefits |  | (2,100) | (1,600) | 7,900 |
Accrued interest and penalties related to unrecognized tax benefits |  | 22,700 | 24,800 |  |
Tax reconciliation related to accumulated foreign earnings, net of related valuation allowance change | $ 3,700 | 0 | 0 | $ 3,709 |
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 |  | 31,300 |  |  |
Deferred tax liability, undistributed foreign earnings |  | 12,000 | 11,900 |  |
Decrease of deferred tax liabilities from undistributed foreign earnings |  | 100 |  |  |
Undistributed foreign U.S GAAP retained earnings not taxed |  | 6,000,000 |  |  |
Federal and State Tax Authorities |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred tax assets, valuation allowance |  | 319,000 | 300,000 |  |
Foreign Tax Authorities |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred tax assets, valuation allowance |  | $ 313,000 | $ 311,000 |  |

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