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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Total investments	$ 698,977	$ 1,007,339
Investments, at fair value	683,496	991,089
Securities sold, not yet purchased, at fair value (included in "other liabilities")	4,651	6,828
Debt [Member]
Schedule of Investments [Line Items]
Total investments		299,990
Investments, at fair value		299,990
Equities [Member]
Schedule of Investments [Line Items]
Total investments	43,889	54,040
Investments, at fair value	43,889	54,040
Alternative Investment Funds [Member]
Schedule of Investments [Line Items]
Total investments	56,947	49,757
Investments, at fair value	56,947	49,757
Debt Funds [Member]
Schedule of Investments [Line Items]
Total investments	178,556	164,952
Investments, at fair value	178,556	164,952
Equity Funds [Member]
Schedule of Investments [Line Items]
Total investments	350,282	375,761
Investments, at fair value	350,282	375,761
Private Equity Funds [Member]
Schedule of Investments [Line Items]
Total investments	53,822	46,589
Investments, at fair value	53,822	46,589
Funds Total [Member]
Schedule of Investments [Line Items]
Total investments	639,607	637,059
Equity Method Investments [Member]
Schedule of Investments [Line Items]
Total investments	$ 15,481	$ 16,250

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Fair value of obligations incurred from short sales.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 35
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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