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Fair Value Measurements - Fair Value of Certain Investments Based on NAV (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 71,135 $ 52,985
Unfunded Commitments 5,597 5,865
Hedge Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 24,162 $ 16,216
Hedge Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 79.00% 99.00%
Hedge Funds [Member] | Quarterly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 21.00% 1.00%
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 $ 623 $ 637
Other [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 92.00% 92.00%
Other [Member] | Daily [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 8.00% 8.00%
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 $ 5
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 $ 49 $ 46
Equity Funds [Member] | Annually [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 64.00% 61.00%
Equity Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 36.00% 39.00%
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 $ 46,296 $ 36,081
Unfunded Commitments $ 5,597 $ 5,865
% of Fair Value Not Redeemable 100.00% 100.00%