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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Schedule Of Income Tax [Line Items]              
Tax effected NOLs - US $ 382     $ 382      
NOL expiration date       2024      
Tax effected NOLs - International       $ 2,016      
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 $ 21,872 $ 22,222   $ 21,872   $ 22,427 $ 27,016
Tax effected capital loss $ 16,368     $ 16,368     16,596
Estimated effective rate 7.90%   123.70% 6.70% 7.40%    
Income tax expense/(benefit) $ 500   $ 1,408 $ 2,790 $ (1,767)    
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 6,995     6,995      
Decrease in accrued interest and penalties over the next 12 months       2,041      
Unremitted earnings – International subsidiaries 185     185     $ 138
UNITED KINGDOM              
Schedule Of Income Tax [Line Items]              
Release of deferred tax valuation allowance on interest carryforwards         $ 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 $ 21,872     $ 21,872      
[1] Recorded as an income tax benefit of $5,171 during the nine months ended September 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 nine months ended September 30, 2020, an income tax benefit of $5,981 was recorded along with an equal and offsetting amount in other gains and losses, net.