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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Apr. 11, 2018
Dec. 31, 2017
Liabilities:      
Deferred consideration $ 162,848 $ 172,746  
Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash and cash equivalents 70,744   $ 54,193
Securities owned, at fair value 3,719   66,294
Total 74,463   120,487
Liabilities:      
Deferred consideration 162,848    
Securities sold, but not yet purchased 2,026   950
Total 164,874   950
Fair Value, Measurements, Nonrecurring [Member]      
Assets:      
AdvisorEngine Inc. - Option 3,278   3,278
Thesys Group, Inc. - Series Y preferred stock 6,909   6,909
Total 10,187   10,187
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash and cash equivalents 70,744   54,193
Securities owned, at fair value 3,719   1,691
Total 74,463   55,884
Liabilities:      
Securities sold, but not yet purchased 2,026   950
Total 2,026   950
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]      
Assets:      
Securities owned, at fair value     64,603
Total     64,603
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]      
Liabilities:      
Deferred consideration 162,848    
Total 162,848    
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Assets:      
AdvisorEngine Inc. - Option 3,278   3,278
Thesys Group, Inc. - Series Y preferred stock 6,909   6,909
Total $ 10,187   $ 10,187