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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Tax effected NOLs - US | $ 382 |  |  |  | $ 382 |  |
NOL expiration date |  |  |  |  | 2024 |  |
Tax effected NOLs - International |  |  |  |  | $ 2,093 |  | $ 2,167
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 | $ 22,427 | $ 22,222 |  |  | $ 22,427 |  | 27,016
Tax effected capital loss | $ 16,596 |  |  |  | $ 16,596 |  | 16,596
Estimated effective rate | 19.50% |  |  | 5.70% | 6.50% | 12.70% |
Income tax expense/(benefit) | $ 4,259 |  |  | $ (804) | $ 2,290 | $ (3,175) |
Reduction in unrecognized tax benefits |  | $ 5,171 | [1] |  | 5,171 | 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 | 7,152 |  |  |  | 7,152 |  |
Decrease in accrued interest and penalties over the next 12 months |  |  |  |  | 2,064 |  |
Unremitted earnings – International subsidiaries | 131 |  |  |  | 131 |  | $ 138
UNITED KINGDOM |  |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Release of deferred tax valuation allowance on interest carryforwards |  |  |  | $ 2,842 |  | $ 2,842 |
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 | $ 22,427 |  |  |  | $ 22,427 |  |
[1] | Recorded as an income tax benefit of $5,171 during the six months ended June 30, 2021, along with an equal and offsetting amount recorded in other gains and losses, net, to recognize a reduction in the indemnification asset. During the six months ended June 30, 2020, an income tax benefit of $5,981 was recorded along with an equal and offsetting amount in other gains and losses, net.

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