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Fair Value Disclosures - Quantitative Information about Significant Unobservable Inputs Used in Level 3 Fair Value Measurements (Detail)
 12 Months Ended
Nov. 30, 2016
USD ($)
T / d
$ / shares
Nov. 30, 2015
USD ($)
$ / shares
Nov. 30, 2014
USD ($)
Nov. 30, 2013
USD ($)
Embedded conversion option [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments sold, not yet purchased | $   $ 0 $ 693,000 $ 9,574,000
Corporate equity securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ $ 21,739,000 40,906,000 20,964,000 9,884,000
Corporate debt securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 25,005,000 25,876,000 22,766,000 25,666,000
CDOs and CLOs [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 54,354,000 85,092,000 124,650,000 37,216,000
Residential mortgage-backed securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 38,772,000 70,263,000 82,557,000 105,492,000
Commercial mortgage-backed securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 20,580,000 14,326,000 26,655,000 17,568,000
Other asset-backed securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 40,911,000 42,925,000 2,294,000 12,611,000
Loans and other receivables [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 81,872,000 189,289,000 97,258,000 145,890,000
Investments at fair value [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 96,369,000 53,120,000 $ 53,224,000 $ 66,931,000
Financial Instruments Owned [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 6,429,000 19,785,000    
Financial Instruments Owned [Member] | Corporate equity securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 19,799,000 20,285,000    
Financial Instruments Owned [Member] | Corporate debt securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 25,005,000 20,257,000    
Financial Instruments Owned [Member] | CDOs and CLOs [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 33,016,000 49,923,000    
Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 38,772,000 70,263,000    
Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 20,580,000 14,326,000    
Financial Instruments Owned [Member] | Other asset-backed securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 40,911,000 21,463,000    
Financial Instruments Owned [Member] | Loans and other receivables [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments owned | $ 54,347,000 161,470,000    
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]        
Fair value of financial instruments owned | $ 42,907,000 7,693,000    
Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments sold, not yet purchased | $ $ 9,870,000 19,543,000    
Financial Instruments Sold, Not Yet Purchased [Member] | Loans and Other Receivables [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value of financial instruments sold, not yet purchased | $   $ 10,469,000    
Level 3 [Member] | Financial Instruments Owned [Member] | Credit default swaps [Member] | Market approach [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant default rate/Credit spread 2.65%      
Level 3 [Member] | Financial Instruments Owned [Member] | Equity swaps [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share) $ 102      
Level 3 [Member] | Financial Instruments Owned [Member] | Unfunded commitment [Member] | Market approach [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant default rate/Credit spread   2.98%    
Level 3 [Member] | Financial Instruments Owned [Member] | Unfunded commitment [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 100    
Level 3 [Member] | Financial Instruments Owned [Member] | Total return swaps [Member] | Minimum [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   91.7    
Level 3 [Member] | Financial Instruments Owned [Member] | Total return swaps [Member] | Maximum [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   92.4    
Level 3 [Member] | Financial Instruments Owned [Member] | Total return swaps [Member] | Weighted Average [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 92.1    
Level 3 [Member] | Financial Instruments Owned [Member] | Commodity forwards [Member] | Market approach [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield   47.00%    
Significant Unobservable Input(s), Transaction level (in dollars per share)   $ 9,500,000    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Minimum [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) 3      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Maximum [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) 75      
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), Transaction level (in dollars per share)   $ 1    
Significant Unobservable Input(s), EBITDA multiple   4.4    
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 (in dollars per share) $ 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 (in tons per day) | T / d 666      
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Minimum [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)   $ 5    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Maximum [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)   102    
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Non-exchange traded securities [Member] | Weighted Average [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) $ 15 19    
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 $ 59    
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), Discount rate/yield 9.00% 86.00%    
Significant Unobservable Input(s), Volatility 40.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Collateralized debt obligations [Member] | Minimum [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 10.00%      
Significant Unobservable Input(s), Constant default rate/Credit spread 2.00%      
Significant Unobservable Input(s), Loss severity 25.00%      
Significant Unobservable Input(s), Yield 7.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Collateralized debt obligations [Member] | Maximum [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%      
Significant Unobservable Input(s), Constant default rate/Credit spread 4.00%      
Significant Unobservable Input(s), Loss severity 70.00%      
Significant Unobservable Input(s), Yield 17.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Minimum [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate   5.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread   2.00%    
Significant Unobservable Input(s), Loss severity   25.00%    
Significant Unobservable Input(s), Yield   6.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Minimum [Member] | Scenario analysis [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 28.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Maximum [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%    
Significant Unobservable Input(s), Constant default rate/Credit spread   8.00%    
Significant Unobservable Input(s), Loss severity   90.00%    
Significant Unobservable Input(s), Yield   13.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Maximum [Member] | Scenario analysis [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 38.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Weighted Average [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 19.00% 13.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread 2.00% 2.00%    
Significant Unobservable Input(s), Loss severity 40.00% 52.00%    
Significant Unobservable Input(s), Yield 12.00% 10.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Weighted Average [Member] | Scenario analysis [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 31.00%      
Level 3 [Member] | Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member] | Minimum [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 0.00% 0.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread 1.00% 1.00%    
Significant Unobservable Input(s), Loss severity 35.00% 25.00%    
Significant Unobservable Input(s), Yield 2.00% 1.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member] | Maximum [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 11.00% 50.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread 7.00% 9.00%    
Significant Unobservable Input(s), Loss severity 100.00% 70.00%    
Significant Unobservable Input(s), Yield 10.00% 9.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member] | Weighted Average [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 5.00% 13.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread 3.00% 3.00%    
Significant Unobservable Input(s), Loss severity 62.00% 39.00%    
Significant Unobservable Input(s), Yield 6.00% 6.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member] | Minimum [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Yield 6.00% 7.00%    
Significant Unobservable Input(s), Cumulative loss rate 5.00% 2.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member] | Maximum [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Yield 11.00% 30.00%    
Significant Unobservable Input(s), Cumulative loss rate 95.00% 63.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member] | Weighted Average [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Yield 8.00% 16.00%    
Significant Unobservable Input(s), Cumulative loss rate 39.00% 23.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Price (in dollars per share) $ 72      
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Minimum [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 4.00% 6.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread 0.00% 3.00%    
Significant Unobservable Input(s), Loss severity 0.00% 55.00%    
Significant Unobservable Input(s), Yield 4.00% 7.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Minimum [Member] | Over collateralization percentage [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Over collateralization percentage   117.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Maximum [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% 8.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread 31.00% 5.00%    
Significant Unobservable Input(s), Loss severity 100.00% 75.00%    
Significant Unobservable Input(s), Yield 17.00% 22.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Maximum [Member] | Over collateralization percentage [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Over collateralization percentage   125.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Weighted Average [Member] | Discounted cash flows [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 14.00% 7.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread 13.00% 4.00%    
Significant Unobservable Input(s), Loss severity 90.00% 62.00%    
Significant Unobservable Input(s), Yield 15.00% 18.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Weighted Average [Member] | Over collateralization percentage [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Over collateralization percentage   118.00%    
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), Transaction level (in dollars per share) $ 0      
Significant Unobservable Input(s), EBITDA multiple 3.3 10.0    
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 (in tons per day) | T / d 666      
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Minimum [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 2.00% 2.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Minimum [Member] | Scenario analysis [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 6.00% 6.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Minimum [Member] | Comparable pricing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 99    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Maximum [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% 17.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Maximum [Member] | Scenario analysis [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 50.00% 100.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Maximum [Member] | Comparable pricing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 100    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Weighted Average [Member] | Market approach [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield 3.00% 12.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Weighted Average [Member] | Scenario analysis [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Estimated recovery percentage 37.00% 83.00%    
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Weighted Average [Member] | Comparable pricing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 99.7    
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), Transaction level (in dollars per share) $ 250 $ 64    
Significant Unobservable Input(s), Price | $ $ 25,815,720 $ 5,200,000    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Equity swaps [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share) $ 102      
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Equity options [Member] | Option model [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Volatility 45.00% 45.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Equity options [Member] | Default Probability [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Default probability 0.00% 0.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Unfunded commitment [Member] | Market approach [Member] | Derivatives [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] | Unfunded commitment [Member] | Discounted cash flows [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate   20.00%    
Significant Unobservable Input(s), Constant default rate/Credit spread   2.00%    
Significant Unobservable Input(s), Loss severity   25.00%    
Significant Unobservable Input(s), Yield   11.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Unfunded commitment [Member] | Minimum [Member] | Market approach [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield   3.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Unfunded commitment [Member] | Minimum [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 79    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Unfunded commitment [Member] | Maximum [Member] | Market approach [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield   10.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Unfunded commitment [Member] | Maximum [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 100    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Unfunded commitment [Member] | Weighted Average [Member] | Market approach [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Discount rate/yield   10.00%    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Unfunded commitment [Member] | Weighted Average [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 82.6    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Total return swaps [Member] | Minimum [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   91.7    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Total return swaps [Member] | Maximum [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   92.4    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Total return swaps [Member] | Weighted Average [Member] | Comparable pricing [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   92.1    
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Variable funding note swaps [Member] | Discounted cash flows [Member] | Derivatives [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Constant prepayment rate 20.00%      
Significant Unobservable Input(s), Constant default rate/Credit spread 2.00%      
Significant Unobservable Input(s), Loss severity 25.00%      
Significant Unobservable Input(s), Yield 16.00%      
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Loans and Other Receivables [Member] | Comparable pricing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Significant Unobservable Input(s), Comparable asset price (in dollars per share)   $ 100