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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Total investments	$ 741,868	$ 698,977
Investments, at fair value	741,868	683,496
Securities sold, not yet purchased, at fair value (included in "other liabilities")	4,106	4,651
Debt [Member]
Schedule of Investments [Line Items]
Total investments	4,116
Investments, at fair value	4,116
Equities [Member]
Schedule of Investments [Line Items]
Total investments	52,088	43,889
Investments, at fair value	52,088	43,889
Alternative Investment Funds [Member]
Schedule of Investments [Line Items]
Total investments	70,233	56,947
Investments, at fair value	70,233	56,947
Debt Funds [Member]
Schedule of Investments [Line Items]
Total investments	205,701	178,556
Investments, at fair value	205,701	178,556
Equity Funds [Member]
Schedule of Investments [Line Items]
Total investments	358,202	350,282
Investments, at fair value	358,202	350,282
Private Equity Funds [Member]
Schedule of Investments [Line Items]
Total investments	51,528	53,822
Investments, at fair value	51,528	53,822
Funds Total [Member]
Schedule of Investments [Line Items]
Total investments	$ 685,664	639,607
Equity Method Investments [Member]
Schedule of Investments [Line Items]
Total investments		$ 15,481

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- Definition

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
-Subparagraph (b)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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