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Fair Value Measurements - Fair Value of Certain Investments Based on NAV (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 74,603 $ 64,968
Unfunded Commitments 5,455 5,455
Hedge Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 41,526 $ 29,259
Hedge Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 73.00% 68.00%
Hedge Funds [Member] | Quarterly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 27.00% 32.00%
Hedge Funds [Member] | Minimum [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Redemption Notice Period 30 days 30 days
Hedge Funds [Member] | Maximum [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Redemption Notice Period 60 days 60 days
Other [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 641 $ 615
Other [Member] | Daily [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 5.00% 5.00%
Other [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 95.00% 95.00%
Other [Member] | Minimum [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Redemption Notice Period 30 days 30 days
Other [Member] | Maximum [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Redemption Notice Period 30 days 30 days
Debt Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 5 $ 4
Investments Redeemable, Redemption Notice Period 30 days 30 days
Debt Funds [Member] | Daily [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 100.00% 100.00%
Equity Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 42 $ 40
Equity Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 34.00% 35.00%
Equity Funds [Member] | Annually [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 66.00% 65.00%
Equity Funds [Member] | Minimum [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Redemption Notice Period 30 days 30 days
Equity Funds [Member] | Maximum [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Redemption Notice Period 60 days 60 days
Private Equity Funds [Member] | Equity Growth [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 32,389 $ 35,050
Unfunded Commitments $ 5,455 $ 5,455
% of Fair Value Not Redeemable 100.00% 100.00%