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Fair Value Measurements - Fair Value of Certain Investments Based on NAV (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 129,591 $ 122,732
Unfunded Commitments 9,183 10,242
Hedge Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 6,190 $ 20,410
Hedge Funds [Member] | Weekly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 73.00% 23.00%
Hedge Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 2.00% 69.00%
Hedge Funds [Member] | Quarterly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 25.00% 8.00%
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
Funds of Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 492 $ 465
Funds of Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 98.00% 98.00%
Funds of Funds [Member] | Quarterly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 2.00% 2.00%
Funds of 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
Funds of Funds [Member] | Maximum [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Redemption Notice Period 90 days 90 days
Other [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 443 $ 1,590
Other [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 93.00% 80.00%
Other [Member] | Daily [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 7.00% 20.00%
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 60 days 60 days
Debt Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 6 $ 6
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 $ 39 $ 42
Equity Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 50.00% 54.00%
Equity Funds [Member] | Quarterly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 31.00% 28.00%
Equity Funds [Member] | Daily [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 19.00% 18.00%
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 90 days 90 days
Private Equity Funds [Member] | Equity Growth [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 90,824 $ 67,895
Unfunded Commitments $ 9,183 $ 10,242
% of Fair Value Not Redeemable 100.00% 100.00%
Estimated Liquidation Period of Investments Not Redeemable, % Next 5 Years 12.00% 18.00%
Estimated Liquidation Period of Investments Not Redeemable, % 5-10 Years 33.00% 39.00%
Estimated Liquidation Period of Investments Not Redeemable, % Thereafter 55.00% 43.00%
Private Equity Funds [Member] | Mezzanine Debt [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 31,597 $ 32,324
% of Fair Value Not Redeemable 100.00% 100.00%
Estimated Liquidation Period of Investments Not Redeemable, % Thereafter 100.00% 100.00%