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v3.22.1

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, 2022 | Mar. 31, 2021
Operating Expenses: |  |
Total operating expenses | $ 60,679 | $ 52,649
Previously Reported [Member] |  |
Operating Revenues: |  |
Total revenues |  | 72,830
Operating Expenses: |  |
Total operating expenses |  | 54,223
Previously Reported [Member] | Advisory Fees [Member] |  |
Operating Revenues: |  |
Total revenues |  | 71,616
Previously Reported [Member] | Fund Management And Administration [Member] |  |
Operating Expenses: |  |
Total operating expenses |  | 15,521
Adjustment [Member] |  |
Operating Revenues: |  |
Amounts collected on behalf of third parties |  | (1,574)
Operating Expenses: |  |
Amounts collected on behalf of third parties |  | (1,574)
Adjustment [Member] | Advisory Fees [Member] |  |
Operating Revenues: |  |
Amounts collected on behalf of third parties |  | (1,574)
Operating Expenses: |  |
Amounts collected on behalf of third parties |  | (1,574)
As Corrected [Member] |  |
Operating Revenues: |  |
Total revenues |  | 71,256
Operating Expenses: |  |
Total operating expenses |  | 52,649
As Corrected [Member] | Advisory Fees [Member] |  |
Operating Revenues: |  |
Total revenues |  | 70,042
As Corrected [Member] | Fund Management And Administration [Member] |  |
Operating Expenses: |  |
Total operating expenses |  | $ 13,947

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