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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 27, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jun. 30, 2020
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |  |  |
Tax effected NOLs - US |  | $ 514 |  |  |  | $ 514 |  |  |
NOL expiration date |  |  |  |  |  | 2024 |  |  |
Tax effected NOLs - International |  |  |  |  |  | $ 4,651 |  | $ 9,336 |
Federal statutory rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |  |
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return |  | $ 25,502 | $ 24,429 |  |  | $ 25,502 |  | 32,101 | $ 24,364
Tax effected capital loss |  | $ 16,734 |  |  |  | $ 16,734 |  | 8,226 |
Estimated effective rate |  | 123.70% |  |  | 51.90% | 7.40% | 31.20% |  |
Income tax expense/(benefit) |  | $ 1,408 |  |  | $ 4,483 | $ (1,767) | $ 7,021 |  |
Reduction in unrecognized tax benefits |  |  | $ 5,981 | [1] |  | 5,981 | $ 4,309 |  |
Non-taxable gain recognized upon sale of our Canadian ETF business |  |  |  |  |  | 2,877 |  |  |
Decrease in unrecognized tax benefits in the next 12 months |  | 4,756 |  |  |  | 4,756 |  |  |
Decrease in accrued interest and penalties over the next 12 months |  |  |  |  |  | 1,427 |  |  |
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 |  |  |  |  |  | 2,842 |  |  |
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% |  |  |  |  |  |  |  |
Net operating losses carryforwards term | 5 years |  |  |  |  |  |  |  |
Adjusted interest expense deduction limit percent | 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 |  | $ 25,502 |  |  |  | $ 25,502 |  | $ 32,101 |
[1] | Recorded as an income tax benefit of $5,981 during the nine months ended September 30, 2020, along with an equal and offsetting amount recorded in other gains and losses, net, to recognize a reduction in the indemnification asset. During the nine months ended September 30, 2019, an income tax benefit of $4,309 was recorded along with an equal and offsetting amount in other gains and losses, net.

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