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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax $ 11,901 $ (7,397) $ 25
Decrease in unrecognized tax benefits, net (5,014) (5,661) (3,893)
Foreign operations (3,211) (3,342) (3,561)
Change in tax-related indemnification assets, net 1,053 1,189 740
Non-deductible executive compensation 881 399 1,608
Stock-based compensation tax shortfalls 647 1,485 1,198
(Gain)/loss on revaluation of deferred consideration [1] (424) 11,929 2,378
Blended state income tax rate, net of federal benefit 526 (171) 237
Change in valuation allowance – Capital losses 5 4,448 7,555
Change in valuation allowance – Foreign net operating losses ("NOLs") and interest carryforwards 0 (2,018) 3,997
Non-taxable gain on sale – Canadian ETF business 0 (740)  
Other differences, net 510 312 262
Income tax expense $ 6,874 $ 433 $ 10,546
[1] The (gain)/loss on revaluation is not adjusted for income taxes as the obligation was assumed by a wholly-owned subsidiary that is based in Jersey, a jurisdiction where the Company is subject to a zero percent tax rate.