Investments - Schedule of Company's Investments in Limited Partnerships (Parenthetical) (Detail)	3 Months Ended
Mar. 31, 2025
Private US Lower Middle Market Companies [Member]
Schedule Of Investments [Line Items]
Expected term	2 years
Bank Loans Public and Private Corporate Bonds Asset Backed Securities Equity and Debt Restructuring [Member]
Schedule Of Investments [Line Items]
Investment Additional Maturity Term	2 years
Power Utility and Energy Industries and Infrastructure [Member]
Schedule Of Investments [Line Items]
Expected term	10 years
Investment Additional Maturity Term	3 years
Senior and Junior Debts of Private Equity-Backed Companies [Member]
Schedule Of Investments [Line Items]
Expected term	8 years
Investment additional maturity term	2 years
Mature Real Estate Private Equity Funds And Portfolios Globally [Member]
Schedule Of Investments [Line Items]
Maturity date	Nov. 27, 2027
Investment additional maturity term	2 years
Investment additional maturity term	4 years
Credit and Equity Investments, Primarily in Private Equity-Owned Companies [Member]
Schedule Of Investments [Line Items]
Expected term	8 years
Investment additional maturity term	1 year
Investment additional maturity term	2 years

Represents the maximum investment period that can be extended.

No definition available.

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- Definition

Represents the maximum investment period that can be extended at the general partner's discretion.

+ References

No definition available.

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Represents the maximum investment period that can be extended with the consent of the advisory committee.

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- Definition

Represents the maximum investment period that can be extended with the consent of either the advisory committee or a majority of limited partners.

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Expected contractual term of limited partnership investment.

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- Definition

Expected contractual term of limited partnership investment following the maturity of the fund's outstanding leverage.

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Maturity date of investment, in YYYY-MM-DD format.

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