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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Liabilities:    
Deferred consideration (Note 11) $ 161,273 $ 161,540
Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash equivalents 1,811 24
Securities owned, at fair value 9,095 8,873
Total 10,906 8,897
Liabilities:    
Deferred consideration (Note 11) 161,273 161,540
Securities sold, but not yet purchased 543 1,698
Total 161,816 163,238
Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Thesys Group, Inc. – Series Y preferred stock(1)   3,080
Total   3,080
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash equivalents 1,811 24
Securities owned, at fair value 9,095 8,873
Total 10,906 8,897
Liabilities:    
Securities sold, but not yet purchased 543 1,698
Total 543 1,698
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Liabilities:    
Deferred consideration (Note 11) 161,273 161,540
Total $ 161,273 161,540
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets:    
Thesys Group, Inc. – Series Y preferred stock(1)   3,080
Total   $ 3,080