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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, 2017
Dec. 31, 2016
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 88,848 $ 129,591
Unfunded Commitments 9,183 9,183
Hedge Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 5,974 $ 6,190
Hedge Funds [Member] | Weekly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 48.00% 73.00%
Hedge Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 2.00% 2.00%
Hedge Funds [Member] | Quarterly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 50.00% 25.00%
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 $ 505 $ 492
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 $ 568 $ 443
Other [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 94.00% 93.00%
Other [Member] | Daily [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 6.00% 7.00%
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 $ 42 $ 39
Equity Funds [Member] | Monthly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 51.00% 50.00%
Equity Funds [Member] | Quarterly [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 31.00% 31.00%
Equity Funds [Member] | Daily [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Investments Redeemable, Percent 18.00% 19.00%
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 $ 81,753 $ 90,824
Unfunded Commitments $ 9,183 $ 9,183
% of Fair Value Not Redeemable 100.00% 100.00%
Estimated Liquidation Period of Investments Not Redeemable, % Next 5 Years 14.00% 12.00%
Estimated Liquidation Period of Investments Not Redeemable, % 5-10 Years 40.00% 33.00%
Estimated Liquidation Period of Investments Not Redeemable, % Thereafter 46.00% 55.00%
Private Equity Funds [Member] | Mezzanine Debt [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value   $ 31,597
% of Fair Value Not Redeemable   100.00%
Estimated Liquidation Period of Investments Not Redeemable, % Thereafter   100.00%