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Investments - Schedule of Company's Investments in Limited Partnerships (Parenthetical) (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Schedule Of Investments [Line Items] |
Additional funding circumstances | $ 843
Private US Lower Middle Market Companies [Member] |
Schedule Of Investments [Line Items] |
Expected term | 10 years
Investment additional maturity term | 2 years
Bank Loans Public and Private Corporate Bonds Asset Backed Securities Equity and Debt Restructuring [Member] |
Schedule Of Investments [Line Items] |
Expected term | 3 years
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 | 6 years
Investment additional maturity term | 2 years
Expiration date of capital commitment | Dec. 01, 2020
Mature Real Estate Private Equity Funds And Portfolio Globally [Member] |
Schedule Of Investments [Line Items] |
Expected term | 8 years

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