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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Expenses: |  |  |
Total operating expenses | $ 215,260 | $ 194,830 | $ 212,994
Previously Reported [Member] |  |  |
Operating Revenues: |  |  |
Total revenues |  | 253,699 | 268,403
Operating Expenses: |  |  |
Total operating expenses |  | 198,617 | 214,869
Previously Reported [Member] | Advisory Fees [Member] |  |  |
Operating Revenues: |  |  |
Total revenues |  | 250,182 | 265,652
Previously Reported [Member] | Fund Management And Administration [Member] |  |  |
Operating Expenses: |  |  |
Total operating expenses |  | 60,515 | 61,502
Adjustment [Member] |  |  |
Operating Revenues: |  |  |
Amounts collected on behalf of third parties |  | (3,787) | (1,875)
Operating Expenses: |  |  |
Amounts collected on behalf of third parties |  | (3,787) | (1,875)
Adjustment [Member] | Advisory Fees [Member] |  |  |
Operating Revenues: |  |  |
Amounts collected on behalf of third parties |  | (3,787) | (1,875)
Operating Expenses: |  |  |
Amounts collected on behalf of third parties |  | (3,787) | (1,875)
As Corrected [Member] |  |  |
Operating Revenues: |  |  |
Total revenues |  | 249,912 | 266,528
Operating Expenses: |  |  |
Total operating expenses |  | 194,830 | 212,994
As Corrected [Member] | Advisory Fees [Member] |  |  |
Operating Revenues: |  |  |
Total revenues |  | 246,395 | 263,777
As Corrected [Member] | Fund Management And Administration [Member] |  |  |
Operating Expenses: |  |  |
Total operating expenses |  | $ 56,728 | $ 59,627

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