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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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Revenues:      
Advisory fees   $ 226,692 $ 218,217
Settlement gain   6,909  
Other income   1,603 703
Total revenues (currently reported) $ 274,116 228,295 218,920
Operating Expenses:      
Professional and consulting fees 7,984 5,254 6,692
Acquisition related costs 11,454 4,832  
Impairments 17,386   1,676
Acquisition payment     6,738
Other Income/(Expenses):      
Other gains and losses, net (205) (666) (585)
Interest income $ 3,093 2,861 1,111
Acquisition payment     6,738
Previously Reported [Member]      
Operating Revenues:      
Advisory fees   227,775 218,465
Settlement gain   6,909  
Other income   2,715 981
Operating Expenses:      
Professional and consulting fees   10,086 6,692
Impairments     1,676
Acquisition payment     6,738
Other Income/(Expenses):      
Acquisition payment     6,738
Restatement Adjustment [Member] | Advisory Fees Reclassified To Other Income [Member]      
Operating Revenues:      
Advisory fees   (1,083) (248)
Restatement Adjustment [Member] | Settlements Gain Reclassified To Other Income Expenses [Member]      
Operating Revenues:      
Settlement gain   (6,909)  
Restatement Adjustment [Member] | Other Exchange Trade Product Fees Reclassified From Advisory Fees [Member]      
Operating Revenues:      
Other income   1,083 248
Restatement Adjustment [Member] | Interest Income Reclassified to Other Income Expenses [Member]      
Operating Revenues:      
Other income   (2,861) (1,111)
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified to Other Losses Net [Member]      
Operating Revenues:      
Other income   1,514 585
Restatement Adjustment [Member] | Miscellaneous Other Income Reclassified To Other Losses Net [Member]      
Operating Revenues:      
Other income   (848)  
Restatement Adjustment [Member] | Interest Income Reclassified From Operating Revenues [Member]      
Other Income/(Expenses):      
Interest income   2,861 1,111
Restatement Adjustment [Member] | Settlement Gain Reclassified from Operating Revenues [Member]      
Operating Revenues:      
Settlement gain   6,909  
Restatement Adjustment [Member] | Impairment reclassified from operating expenses [Member]      
Operating Expenses:      
Impairments     (1,676)
Restatement Adjustment [Member] | Acquisition payment reclassified from operating expenses [Member]      
Operating Expenses:      
Acquisition payment     (6,738)
Other Income/(Expenses):      
Acquisition payment     (6,738)
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified From Operating Revenues [Member]      
Other Income/(Expenses):      
Other gains and losses, net   (1,514) (585)
Restatement Adjustment [Member] | Miscellaneous Other Income Reclassified From Operating Revenues [Member]      
Other Income/(Expenses):      
Other gains and losses, net   848  
Restatement Adjustment [Member] | Professional and Consulting Fee Reclassified to Acquisition Related Costs [Member]      
Operating Expenses:      
Professional and consulting fees   (4,832)  
Restatement Adjustment [Member] | Acquisition Related Costs Reclassified from Professional and Consulting Fees [Member]      
Operating Expenses:      
Acquisition related costs   $ 4,832  
Restatement Adjustment [Member] | Impairment Reclassified to Other Income (Expense) [Member]      
Operating Expenses:      
Impairments     (1,676)
Restatement Adjustment [Member] | Acquisition Payment Reclassified to Other Income (Expense) [Member]      
Operating Expenses:      
Acquisition payment     (6,738)
Other Income/(Expenses):      
Acquisition payment     $ (6,738)