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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Income Tax [Line Items] |  |  |  |
Tax effected NOLs - US |  | $ 510 |  |
NOL expiration date |  | 2024 |  |
Tax effected NOLs - International |  | $ 4,402 | $ 9,336 |
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return |  | 27,016 | 32,101 | $ 34,876
Tax effected capital loss |  | 16,596 | 8,226 |
Reduction in unrecognized tax benefits |  | 5,981 | 4,309 |
Decrease in unrecognized tax benefits in next 12 months, including interest and penalties |  | 5,055 |  |
Decrease in accrued interest and penalties over the next 12 months |  | 1,539 |  |
Unremitted earnings – International subsidiaries |  | 138 |  |
UNITED KINGDOM | Release of Valuation Allowance on Account of Interest Carry Forwards [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Decrease in valuation allowance on deferred tax assets |  | 2,615 |  |
Coronavirus Aid, Relief, and Economic Security Act of 2020 (the "CARES Act") [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Taxable income exemption percentage | 80.00% |  |  |
Adjusted taxable income percentage | 50.00% |  |  |
Original interest expense deduction limit percentage | 30.00% |  |  |
Other Noncurrent Liabilities [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return |  | $ 27,016 | $ 32,101 |

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