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Fair Value Disclosures - Investments at Fair Value (Details) - USD ($)
$ in Thousands
11 Months Ended 12 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Dec. 31, 2013
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Unfunded Commitments $ 14,621 $ 20,996 $ 14,621  
Trading assets 16,895,741 17,463,256 16,895,741  
Equity Long/Short Hedge Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Unfunded Commitments $ 0 $ 0 $ 0  
Percentage of investment at fair value, redemption restriction 94.00% 0.00% 94.00%  
Investment redemption restriction period 36 months      
Percentage of investments redeemable 6.00% 17.00% 6.00%  
Percentage of investments redeemed during period     82.00%  
Equity Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Unfunded Commitments $ 14,621 $ 20,996 $ 14,621  
Equity Funds | Minimum        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Estimated period for the liquidation of the underlying assets   1 year 1 year  
Equity Funds | Maximum        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Estimated period for the liquidation of the underlying assets   9 years 9 years  
Commodity Fund        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Unfunded Commitments 0 $ 0 $ 0  
Multi-asset Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Unfunded Commitments $ 0 $ 0 $ 0  
Percentage of investments redeemable 5.00% 15.00% 5.00%  
Other Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Unfunded Commitments $ 0 $ 0 $ 0  
Fair Value Measured at NAV        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Fair Value 586,934 394,359 586,934  
Fair Value Measured at NAV | Equity Long/Short Hedge Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Fair Value 291,593 86,788 291,593  
Fair Value Measured at NAV | Equity Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Fair Value 44,576 40,070 44,576  
Fair Value Measured at NAV | Commodity Fund        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Fair Value 16,025 10,129 16,025  
Fair Value Measured at NAV | Multi-asset Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Fair Value 234,583 256,972 234,583  
Fair Value Measured at NAV | Other Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Fair Value 157 400 157  
The We Company        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Payments to acquire investments       $ 9,000
Trading assets $ 53,800 $ 254,400 $ 53,800  
The We Company | Maximum        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Ownership percentage by noncontrolling owners (less than) 1.00%   1.00%  
60 Days Prior Written Notice | Equity Long/Short Hedge Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Notice period redemption of investments prior written notice period   60 days 60 days  
60 Days Prior Written Notice | Commodity Fund        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Notice period redemption of investments prior written notice period   60 days 60 days  
30 Days Prior Written Notice | Multi-asset Funds        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Notice period redemption of investments prior written notice period   30 days 30 days