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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.