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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)

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