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Investments - Summary of Financial Information for Company's Equity Method Investments (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statements of operations: |  |  |
Total revenues | $ 77,211 | $ 85,619 | $ 87,790
Total expenses | 61,680 | 72,906 | 73,327
Net income | 15,531 | 12,713 | $ 14,463
Statements of financial condition: |  |  |
Total assets | 90,516 | 102,019 |
Total partners’ capital | 42,229 | 39,161 |
Total liabilities and partners’ capital | 90,516 | 102,019 |
Cash and Cash Equivalents [Member] |  |  |
Statements of financial condition: |  |  |
Total assets | 64,614 | 74,069 |
Fixed Assets, Net [Member] |  |  |
Statements of financial condition: |  |  |
Total assets | 3,120 | 3,420 |
Other Assets [Member] |  |  |
Statements of financial condition: |  |  |
Total assets | 22,782 | 24,530 |
Payables to Related Parties [Member] |  |  |
Statements of financial condition: |  |  |
Total liabilities | 2,000 | 2,000 |
Other Liabilities [Member] |  |  |
Statements of financial condition: |  |  |
Total liabilities | $ 46,287 | $ 60,858 |

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