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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating Revenues: |  |  |  |
Advisory fees |  | $ 57,293 |  | $ 166,177
Settlement gain |  |  |  | 6,909
Other income |  | 421 |  | 1,145
Total revenues (currently reported) | $ 72,570 | 57,714 | $ 206,249 | 167,322
Other Income/(Expenses): |  |  |  |
Other gains and losses, net | $ 118 | (500) | $ (644) | (217)
Previously Reported [Member] |  |  |  |
Operating Revenues: |  |  |  |
Advisory fees |  | 57,574 |  | 166,950
Settlement gain |  |  |  | 6,909
Other income |  | 412 |  | 2,154
Restatement Adjustment [Member] | Advisory Fees Reclassified to Other Income [Member] |  |  |  |
Operating Revenues: |  |  |  |
Advisory fees |  | (281) |  | (773)
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 |  | 281 |  | 773
Restatement Adjustment [Member] | Interest Income Reclassified to Other Income Expenses [Member] |  |  |  |
Operating Revenues: |  |  |  |
Other income |  | (772) |  | (1,999)
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified to Other Gains and Losses Net [Member] |  |  |  |
Operating Revenues: |  |  |  |
Other income |  | 535 |  | 1,054
Restatement Adjustment [Member] | Miscellaneous Other Income Reclassified To Other Gains And Losses, Net [Member] |  |  |  |
Operating Revenues: |  |  |  |
Other income |  | (35) |  | (837)
Restatement Adjustment [Member] | Interest Income Reclassified From Operating Revenues [Member] |  |  |  |
Other Income/(Expenses): |  |  |  |
Other gains and losses, net |  | 772 |  | 1,999
Restatement Adjustment [Member] | Settlement Gain Reclassified from Operating Revenues [Member] |  |  |  |
Other Income/(Expenses): |  |  |  |
Other gains and losses, net |  |  |  | 6,909
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified From Operating Revenues [Member] |  |  |  |
Other Income/(Expenses): |  |  |  |
Other gains and losses, net |  | (535) |  | (1,054)
Restatement Adjustment [Member] | Miscellaneous Other Income Reclassified From Operating Revenues [Member] |  |  |  |
Other Income/(Expenses): |  |  |  |
Other gains and losses, net |  | $ 35 |  | $ 837

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