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Significant Accounting Policies - Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating Revenues:    
Advisory fees   $ 58,456
Other income   448
Total revenues (currently reported) $ 65,485 58,904
Other Income/(Expenses):    
Other losses, net (4,627) (261)
Interest income $ 779 962
Previously Reported [Member]    
Operating Revenues:    
Advisory fees   58,756
Other income   849
Restatement Adjustment [Member] | Advisory Fees Reclassified To Other Income [Member]    
Operating Revenues:    
Advisory fees   (300)
Restatement Adjustment [Member] | Other Exchange Trade Product Fees Reclassified From Advisory Fees [Member]    
Operating Revenues:    
Other income   300
Restatement Adjustment [Member] | Interest Income Reclassified to Other Income Expenses [Member]    
Operating Revenues:    
Other income   (962)
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified to Other Losses Net [Member]    
Operating Revenues:    
Other income   261
Restatement Adjustment [Member] | Interest Income Reclassified From Operating Revenues [Member]    
Other Income/(Expenses):    
Interest income   962
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified From Operating Revenues [Member]    
Other Income/(Expenses):    
Other losses, net   $ (261)