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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Aug. 13, 2020
Jun. 16, 2020
Dec. 31, 2019
Assets:        
Securities owned, at fair value $ 34,895     $ 17,319
Liabilities:        
Deferred consideration (Note 12) 230,137     173,024
Fair Value, Measurements, Recurring [Member]        
Assets:        
Cash equivalents 660     317
Total 35,555     17,636
Liabilities:        
Deferred consideration (Note 12) 230,137     173,024
Securities sold, but not yet purchased       582
Total       173,606
Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]        
Assets:        
Securities owned, at fair value 24,165     17,319
Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]        
Assets:        
Securities owned, at fair value 8,613      
Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member]        
Assets:        
Securities owned, at fair value 2,117      
Fair Value, Measurements, Nonrecurring [Member]        
Assets:        
AdvisorEngine Inc. – Financial interests 0     28,172
Thesys Group, Inc. – Series Y preferred stock 0      
Total 0      
Liabilities:        
Convertible notes 170,191 $ 24,344 $ 145,847  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Cash equivalents 660     317
Total 24,825     17,636
Liabilities:        
Deferred consideration (Note 12) 0      
Securities sold, but not yet purchased       582
Total       582
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]        
Assets:        
Securities owned, at fair value 24,165     17,319
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets:        
AdvisorEngine Inc. – Financial interests 0      
Thesys Group, Inc. – Series Y preferred stock 0      
Total 0      
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Total 10,730      
Liabilities:        
Deferred consideration (Note 12) 0      
Total       0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]        
Assets:        
Securities owned, at fair value 8,613      
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member]        
Assets:        
Securities owned, at fair value 2,117      
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets:        
AdvisorEngine Inc. – Financial interests 0      
Thesys Group, Inc. – Series Y preferred stock 0      
Total 0      
Liabilities:        
Convertible notes 170,191      
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]        
Assets:        
Cash equivalents 0      
Total 0      
Liabilities:        
Deferred consideration (Note 12) 230,137     173,024
Total       173,024
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets:        
AdvisorEngine Inc. – Financial interests 0     $ 28,172
Thesys Group, Inc. – Series Y preferred stock 0      
Total $ 0