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Fair Value Disclosures - Quantitative Information about Significant Unobservable Inputs Used in Level 3 Fair Value Measurements (Detail)
 3 Months Ended 12 Months Ended
Feb. 28, 2017
USD ($)
T / d
$ / shares
Nov. 30, 2016
USD ($)
T / d
$ / shares
Feb. 29, 2016
USD ($)
Nov. 30, 2015
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Value of asset excluded from significant unobservable inputs | $ $ 44,500,000 $ 131,500,000    
Value of liability excluded from significant unobservable inputs | $ 2,000,000 1,600,000    
Corporate equity securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 20,580,000 21,739,000 $ 30,540,000 $ 40,906,000
Corporate debt securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 33,467,000 25,005,000 25,634,000 25,876,000
CDOs and CLOs [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 45,354,000 54,354,000 67,348,000 85,092,000
Municipal securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 26,554,000 27,257,000    
RMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 39,259,000 38,772,000 68,019,000 70,263,000
CMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 20,653,000 20,580,000 21,994,000 14,326,000
Other ABS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 37,702,000 40,911,000 33,124,000 42,925,000
Loans and other receivables [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 53,172,000 81,872,000 155,442,000 189,289,000
Investments at fair value [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 83,785,000 96,369,000 $ 63,582,000 $ 53,120,000
Financial Instruments Owned [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 4,905,000 6,429,000    
Financial Instruments Owned [Member] | Corporate equity securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 18,834,000 19,799,000    
Financial Instruments Owned [Member] | Corporate debt securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 33,467,000 25,005,000    
Financial Instruments Owned [Member] | CDOs and CLOs [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 45,354,000 33,016,000    
Financial Instruments Owned [Member] | RMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 39,259,000 38,772,000    
Financial Instruments Owned [Member] | CMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 20,653,000 20,580,000    
Financial Instruments Owned [Member] | Other ABS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 37,702,000 40,911,000    
Financial Instruments Owned [Member] | Loans and other receivables [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 51,929,000 54,347,000    
Financial Instruments Owned [Member] | Investments at fair value [Member] | Private equity securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments owned, fair value | $ 68,809,000 42,907,000    
Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Instruments sold, not yet purchased, fair value | $ $ 11,318,000 $ 9,870,000    
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Equity swaps [Member] | Comparable pricing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price   $ 102    
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Unfunded commitment [Member] | Market approach [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 82      
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Unfunded commitment [Member] | Market approach [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price 97      
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Unfunded commitment [Member] | Market approach [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 94      
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Credit default swaps [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant default rate / Credit spread 2.65% 2.65%    
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Interest rate swaps [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant default rate / Credit spread 8.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Underlying stock price (in dollars per share) $ 6      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Market approach [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price 3      
Significant Unobservable Input(s), Underlying stock price (in dollars per share)   $ 3    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Market approach [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price 75      
Significant Unobservable Input(s), Underlying stock price (in dollars per share)   75    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Market approach [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price 44      
Significant Unobservable Input(s), Underlying stock price (in dollars per share)   15    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Comparable pricing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Underlying stock price (in dollars per share)   218    
Significant Unobservable Input(s), Comparable asset price $ 9 $ 11    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Present value [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Average silver production | T / d   666    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Option model [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Volatility 40.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Transaction level (in dollars per share)   $ 30    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Market approach [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 18      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Market approach [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price 98      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Market approach [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 53      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Convertible bond model [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Volatility 40.00% 40.00%    
Significant Unobservable Input(s), Discount rate/yield 8.00% 9.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Scenario analysis [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 1.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Scenario analysis [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 3.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Scenario analysis [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 2.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 20.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Discounted cash flows [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 9.00%      
Significant Unobservable Input(s), Constant prepayment rate   10.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread 2.00% 2.00%    
Significant Unobservable Input(s), Loss severity 25.00% 25.00%    
Significant Unobservable Input(s), Yield   7.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Discounted cash flows [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 18.00%      
Significant Unobservable Input(s), Constant prepayment rate   20.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread 8.00% 4.00%    
Significant Unobservable Input(s), Loss severity 70.00% 70.00%    
Significant Unobservable Input(s), Yield   17.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Discounted cash flows [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 13.00%      
Significant Unobservable Input(s), Constant prepayment rate   19.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread 3.00% 2.00%    
Significant Unobservable Input(s), Loss severity 29.00% 40.00%    
Significant Unobservable Input(s), Yield   12.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Scenario analysis [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 4.00% 28.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Scenario analysis [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 45.00% 38.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Scenario analysis [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 30.00% 31.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | RMBS [Member] | Discounted cash flows [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 5.00%      
Significant Unobservable Input(s), Cumulative loss rate 0.00%      
Significant Unobservable Input(s), Duration 4 years      
Significant Unobservable Input(s), Constant prepayment rate   0.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread   1.00%    
Significant Unobservable Input(s), Loss severity   35.00%    
Significant Unobservable Input(s), Yield   2.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | RMBS [Member] | Discounted cash flows [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 11.00%      
Significant Unobservable Input(s), Cumulative loss rate 22.00%      
Significant Unobservable Input(s), Duration 18 years      
Significant Unobservable Input(s), Constant prepayment rate   11.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread   7.00%    
Significant Unobservable Input(s), Loss severity   100.00%    
Significant Unobservable Input(s), Yield   10.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | RMBS [Member] | Discounted cash flows [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 7.00%      
Significant Unobservable Input(s), Cumulative loss rate 7.00%      
Significant Unobservable Input(s), Duration 10 years      
Significant Unobservable Input(s), Constant prepayment rate   5.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread   3.00%    
Significant Unobservable Input(s), Loss severity   62.00%    
Significant Unobservable Input(s), Yield   6.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CMBS [Member] | Discounted cash flows [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 7.00%      
Significant Unobservable Input(s), Cumulative loss rate 15.00% 5.00%    
Significant Unobservable Input(s), Duration 1 year      
Significant Unobservable Input(s), Yield   6.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CMBS [Member] | Discounted cash flows [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 19.00%      
Significant Unobservable Input(s), Cumulative loss rate 68.00% 95.00%    
Significant Unobservable Input(s), Duration 5 years      
Significant Unobservable Input(s), Yield   11.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CMBS [Member] | Discounted cash flows [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 11.00%      
Significant Unobservable Input(s), Cumulative loss rate 30.00% 39.00%    
Significant Unobservable Input(s), Duration 3 years      
Significant Unobservable Input(s), Yield   8.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other ABS [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price   $ 72    
Level 3 [Member] | Financial Instruments Owned [Member] | Other ABS [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 100      
Level 3 [Member] | Financial Instruments Owned [Member] | Other ABS [Member] | Discounted cash flows [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 4.00%      
Significant Unobservable Input(s), Cumulative loss rate 0.00%      
Significant Unobservable Input(s), Duration 1 year      
Significant Unobservable Input(s), Constant prepayment rate   4.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread   0.00%    
Significant Unobservable Input(s), Loss severity   0.00%    
Significant Unobservable Input(s), Yield   4.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other ABS [Member] | Discounted cash flows [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 15.00%      
Significant Unobservable Input(s), Cumulative loss rate 30.00%      
Significant Unobservable Input(s), Duration 11 years      
Significant Unobservable Input(s), Constant prepayment rate   20.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread   31.00%    
Significant Unobservable Input(s), Loss severity   100.00%    
Significant Unobservable Input(s), Yield   17.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other ABS [Member] | Discounted cash flows [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 14.00%      
Significant Unobservable Input(s), Cumulative loss rate 18.00%      
Significant Unobservable Input(s), Duration 2 years      
Significant Unobservable Input(s), Constant prepayment rate   14.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread   13.00%    
Significant Unobservable Input(s), Loss severity   90.00%    
Significant Unobservable Input(s), Yield   15.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other ABS [Member] | Scenario analysis [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 51.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 103.00%      
Significant Unobservable Input(s), EBITDA (a) multiple 3.3 3.3    
Significant Unobservable Input(s), Transaction level (in dollars per share)   $ 0.42    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Market approach [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 98      
Significant Unobservable Input(s), Discount rate/yield   2.00%    
Significant Unobservable Input(s), Transaction level | $ $ 1      
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Market approach [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 100      
Significant Unobservable Input(s), Discount rate/yield   4.00%    
Significant Unobservable Input(s), Transaction level | $ $ 42      
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Market approach [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 99      
Significant Unobservable Input(s), Discount rate/yield   3.00%    
Significant Unobservable Input(s), Transaction level | $ $ 32      
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 32.00%      
Significant Unobservable Input(s), Cumulative loss rate 0.00%      
Significant Unobservable Input(s), Duration 1 month      
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Present value [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Average silver production | T / d 642 666    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Scenario analysis [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 3.00% 6.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Scenario analysis [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 45.00% 50.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Scenario analysis [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 31.00% 37.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Investments at fair value [Member] | Private equity securities [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price   $ 25,815,720    
Significant Unobservable Input(s), Transaction level (in dollars per share)   250    
Level 3 [Member] | Financial Instruments Owned [Member] | Investments at fair value [Member] | Private equity securities [Member] | Market approach [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Transaction level | $ $ 3      
Level 3 [Member] | Financial Instruments Owned [Member] | Investments at fair value [Member] | Private equity securities [Member] | Market approach [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Transaction level | $ 250      
Level 3 [Member] | Financial Instruments Owned [Member] | Investments at fair value [Member] | Private equity securities [Member] | Market approach [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Transaction level | $ $ 116      
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Equity swaps [Member] | Comparable pricing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price   $ 102    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Equity options [Member] | Option model/default rate [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Default probability 0.00%      
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Equity options [Member] | Option model [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Volatility   45.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Equity options [Member] | Default rate [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Default probability   0.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield   4.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [Member] | Market approach [Member] | Minimum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 82      
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [Member] | Market approach [Member] | Maximum [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price 98      
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [Member] | Market approach [Member] | Weighted Average [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price $ 87      
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Variable funding note swaps [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 18.00%      
Significant Unobservable Input(s), Constant prepayment rate 20.00% 20.00%    
Significant Unobservable Input(s), Constant default rate / Credit spread 2.00% 2.00%    
Significant Unobservable Input(s), Loss severity 25.00% 25.00%    
Significant Unobservable Input(s), Yield   16.00%