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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 11, 2018
Dec. 31, 2017
Liabilities:      
Deferred consideration $ 161,540 $ 172,746  
Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash equivalents 24   $ 26,548
Securities owned, at fair value 8,873   66,294
Total 8,897   92,842
Liabilities:      
Deferred consideration 161,540    
Securities sold, but not yet purchased 1,698   950
Total 163,238   950
Fair Value, Measurements, Nonrecurring [Member]      
Assets:      
Thesys—Series Y preferred stock 3,080   6,909
AdvisorEngine—Option     3,278
Total 3,080   10,187
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash equivalents 24   26,548
Securities owned, at fair value 8,873   1,691
Total 8,897   28,239
Liabilities:      
Securities sold, but not yet purchased 1,698   950
Total 1,698   950
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]      
Assets:      
Securities owned, at fair value     64,603
Total     64,603
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]      
Liabilities:      
Deferred consideration 161,540    
Total 161,540    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Assets:      
Thesys—Series Y preferred stock 3,080   6,909
AdvisorEngine—Option     3,278
Total $ 3,080   $ 10,187