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Income Taxes - Additional Information (Detail) £ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 11, 2018 GBP (£) | Apr. 11, 2018 USD ($)
Schedule Of Income Tax [Line Items] |  |  |  |
Tax effected net operating losses that expire | $ 642 |  |  |
NOL expiration date | 2024 |  |  |
Tax effected NOLs - International | $ 9,336 | $ 6,605 |  |
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return | 32,101 | 34,876 |  |
Unrecognized tax benefits that would impact effective tax rate | 32,101 |  |  |
Tax effected capital loss | 8,226 | 794 |  |
Reduction in unrecognized tax benefits | 4,309 |  |  |
Decrease in unrecognized tax benefits in the next 12 months | 4,028 |  |  |
Decrease in accrued interest and penalties over the next 12 months | 1,231 |  |  |
International Tax Authority [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Tax effected net operating losses that expire | $ 4,930 |  |  |
Operating loss Expiration Period | expire between the years 2036 and 2039 |  |  |
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 | $ 32,101 | $ 34,876 |  |
Acquisition Of Etfs Business [Member] |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
Accrued uncertain tax position liability |  |  | £ 22,118 | $ 31,317
Interest and penalties |  |  | £ 5,065 | $ 7,171

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