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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Securities owned, at fair value $ 32,574 $ 17,319
Liabilities:    
Deferred consideration (Note 11) 207,748 173,024
Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash equivalents 2,577 317
Securities owned, at fair value 32,574 17,319
Total 35,151 17,636
Liabilities:    
Deferred consideration (Note 11) 207,748 173,024
Securities sold, but not yet purchased   582
Total   173,606
Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
AdvisorEngine Inc. – Financial interests   28,172
Liabilities:    
Convertible notes 24,344  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash equivalents 2,577 317
Securities owned, at fair value 24,101 17,319
Total 26,678 17,636
Liabilities:    
Securities sold, but not yet purchased   582
Total   582
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Securities owned, at fair value 8,473  
Total 8,473  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Liabilities:    
Convertible notes 24,344  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Liabilities:    
Deferred consideration (Note 11) $ 207,748 173,024
Total   173,024
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
AdvisorEngine Inc. – Financial interests   $ 28,172