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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 27, 2020
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 30, 2020
Schedule Of Income Tax [Line Items]                
Tax effected NOLs - US   $ 514     $ 514      
NOL expiration date         2024      
Tax effected NOLs - International         $ 4,651   $ 9,336  
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   $ 25,502 $ 24,429   $ 25,502   32,101 $ 24,364
Tax effected capital loss   $ 16,734     $ 16,734   8,226  
Estimated effective rate   123.70%   51.90% 7.40% 31.20%    
Income tax expense/(benefit)   $ 1,408   $ 4,483 $ (1,767) $ 7,021    
Reduction in unrecognized tax benefits     $ 5,981 [1]   5,981 $ 4,309    
Non-taxable gain recognized upon sale of our Canadian ETF business         2,877      
Decrease in unrecognized tax benefits in the next 12 months   4,756     4,756      
Decrease in accrued interest and penalties over the next 12 months         1,427      
UNITED KINGDOM | Release of Valuation Allowance on Account of Interest Carry Forwards [Member]                
Schedule Of Income Tax [Line Items]                
Decrease in valuation allowance on deferred tax assets         2,842      
Coronavirus Aid, Relief, and Economic Security Act of 2020 (the "CARES Act") [Member]                
Schedule Of Income Tax [Line Items]                
Taxable income exemption percentage 80.00%              
Net operating losses carryforwards term 5 years              
Adjusted interest expense deduction limit percent 50.00%              
Original interest expense deduction limit percentage 30.00%              
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   $ 25,502     $ 25,502   $ 32,101  
[1] Recorded as an income tax benefit of $5,981 during the nine months ended September 30, 2020, 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, 2019, an income tax benefit of $4,309 was recorded along with an equal and offsetting amount in other gains and losses, net.