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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule Of Income Tax [Line Items] |  |  |  |
Tax effected NOLs - US | $ 382 |  |  |
NOL expiration date | 2024 |  |  |
Tax effected NOLs - International | $ 2,084 |  |  | $ 2,167
Federal statutory rate | 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 | $ 22,222 |  |  | 27,016
Tax effected capital loss | $ 16,596 |  |  | 16,596
Estimated effective rate | (14.90%) |  | 21.50% |
Income tax expense/(benefit) | $ (1,969) |  | $ (2,371) |
Reduction in unrecognized tax benefits | 5,171 | [1] | 5,981 |
Non-taxable gain recognized upon sale of our Canadian ETF business |  |  | $ 2,877 |
Decrease in unrecognized tax benefits in next 12 months, including interest and penalties | 7,067 |  |  |
Decrease in accrued interest and penalties over the next 12 months | 2,016 |  |  |
Unremitted earnings – International subsidiaries | 97 |  |  | $ 138
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 | $ 22,222 |  |  |
[1] | Recorded as an income tax benefit of $5,171 during the three months ended March 31, 2021, along with an equal and offsetting amount recorded in other losses, net, to recognize a reduction in the indemnification asset. During the three months ended March 31, 2020, an income tax benefit of $5,981 was recorded along with an equal and offsetting amount in other losses, net.

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