Fair Value Disclosures - Quantitative Information about Significant Unobservable Inputs Used in Level 3 Fair Value Measurements (Detail) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	May 31, 2017 USD ($) $ / shares	Nov. 30, 2016 USD ($) T / d $ / shares	Feb. 28, 2017 USD ($)	May 31, 2016 USD ($)	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 | $	$ 22,000	$ 131,500
Value of liability excluded from significant unobservable inputs | $	900	1,600
Corporate equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	20,548	21,739	$ 20,580	$ 48,816	$ 30,540	$ 40,906
Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	24,727	25,005	33,467	24,113	25,634	25,876
CDOs and CLOs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	27,255	54,354	45,354	52,710	67,348	85,092
RMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	33,032	38,772	39,259	63,308	68,019	70,263
CMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	16,263	20,580	20,653	24,983	21,994	14,326
Other ABS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	43,349	40,911	37,702	43,033	33,124	42,925
Loans and other receivables [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	49,365	81,872	53,172	104,399	155,442	189,289
Investments at fair value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	89,006	96,369	$ 83,785	$ 57,765	$ 63,582	$ 53,120
Financial Instruments Owned [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	6,860	6,429
Financial Instruments Owned [Member] | Corporate equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	17,196	19,799
Financial Instruments Owned [Member] | Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	24,727	25,005
Financial Instruments Owned [Member] | CDOs and CLOs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	27,255	33,016
Financial Instruments Owned [Member] | RMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	33,032	38,772
Financial Instruments Owned [Member] | CMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	16,263	20,580
Financial Instruments Owned [Member] | Other ABS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value | $	43,349	40,911
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 | $	46,309	54,347
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 | $	73,392	42,907
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 | $	9,882	$ 9,870
Financial Instruments Sold, Not Yet Purchased [Member] | Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments sold, not yet purchased, fair value | $	$ 4,967
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	$ 92
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	98
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	$ 96
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	6	$ 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 (tons per day) | T / d		666
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	9
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	20
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	$ 18
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] | 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	11.00%
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	21.00%
Significant Unobservable Input(s), Constant prepayment rate		20.00%
Significant Unobservable Input(s), Constant default rate / Credit spread	12.00%	4.00%
Significant Unobservable Input(s), Loss severity	30.00%	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	15.00%
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	27.00%	40.00%
Significant Unobservable Input(s), Yield		12.00%
Level 3 [Member] | Financial Instruments Owned [Member] | CDOs and CLOs [Member] | Scenario analysis [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Estimated recovery percentage	40.00%
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		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		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		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 (years)	3 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	10.00%
Significant Unobservable Input(s), Cumulative loss rate	30.00%
Significant Unobservable Input(s), Duration (years)	17 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	8.00%
Significant Unobservable Input(s), Cumulative loss rate	14.00%
Significant Unobservable Input(s), Duration (years)	7 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	5.00%
Significant Unobservable Input(s), Cumulative loss rate	15.00%	5.00%
Significant Unobservable Input(s), Duration (years)	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	45.00%
Significant Unobservable Input(s), Cumulative loss rate	35.00%	95.00%
Significant Unobservable Input(s), Duration (years)	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	12.00%
Significant Unobservable Input(s), Cumulative loss rate	25.00%	39.00%
Significant Unobservable Input(s), Duration (years)	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	$ 100	$ 72
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 (years)	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	18.00%
Significant Unobservable Input(s), Cumulative loss rate	24.00%
Significant Unobservable Input(s), Duration (years)	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	12.00%
Significant Unobservable Input(s), Cumulative loss rate	19.00%
Significant Unobservable Input(s), Duration (years)	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	30.00%
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	35.00%
Significant Unobservable Input(s), EBITDA multiple	1.6	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	$ 42
Significant Unobservable Input(s), Discount rate/yield		2.00%
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%
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	79
Significant Unobservable Input(s), Discount rate/yield		3.00%
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 (tons per day) | T / d		666
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Scenario analysis [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Price	$ 66
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	13.00%	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	40.00%	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 (in dollars per share)	$ 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 (in dollars per share)	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 (in dollars per share)	$ 110
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	$ 92
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	$ 93
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	21.00%
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%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Loans [Member] | Market approach [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Estimated recovery percentage	35.00%