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Income Taxes - Reconciliation Of The Statutory Federal Income Tax Expense And The Company's Total Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax $ (7,397) $ 25 $ 10,718
Loss/(gain) on revaluation of deferred consideration(1) 11,929 2,378 (2,570)
Decrease in unrecognized tax benefits (5,661) (3,893)  
Change in valuation allowance – Capital losses 4,448 7,555 794
Change in valuation allowance – Foreign net operating losses ("NOLs") and interest carryforwards (2,018) 3,997 3,510
Foreign operations (3,342) (3,561) (1,041)
Stock-based compensation tax (windfalls)/shortfalls 1,485 1,198 (543)
Change in tax-related indemnification assets, net 1,189 740  
Non-taxable gain on sale – Canadian ETF business (740)    
Non-deductible executive compensation 399 1,608 4
Blended state income tax rate, net of federal benefit (171) 237 1,406
Non-deductible acquisition and disposition-related costs     1,506
Other differences, net 312 262 622
Income tax expense $ 433 $ 10,546 $ 14,406