Fair Value Disclosures - Quantitative Information about Significant Unobservable Inputs Used in Level 3 Fair Value Measurements (Detail) - USD ($)	6 Months Ended	12 Months Ended
	May 31, 2016	Nov. 30, 2015	Feb. 29, 2016	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014
Embedded conversion option [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments sold, not yet purchased, fair value				$ 725,000	$ 825,000	$ 693,000
Corporate equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	$ 48,816,000	$ 40,906,000	$ 30,540,000	20,547,000	18,210,000	20,964,000
Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	24,113,000	25,876,000	25,634,000	31,917,000	24,795,000	22,766,000
Collateralized debt obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	52,710,000	85,092,000	67,348,000	89,007,000	96,837,000	124,650,000
Residential mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	63,308,000	70,263,000	68,019,000	88,695,000	79,953,000	82,557,000
Commercial mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	24,983,000	14,326,000	21,994,000	17,862,000	24,629,000	26,655,000
Other asset-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	43,033,000	42,925,000	33,124,000	11,857,000	7,146,000	2,294,000
Loans and other receivables [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	104,399,000	189,289,000	155,442,000	108,756,000	111,410,000	97,258,000
Investments at fair value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	57,765,000	53,120,000	$ 63,582,000	$ 131,343,000	$ 128,232,000	$ 53,224,000
Financial Instruments Owned [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	16,311,000	19,785,000
Financial Instruments Owned [Member] | Corporate equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	43,622,000	20,285,000
Financial Instruments Owned [Member] | Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	24,113,000	20,257,000
Financial Instruments Owned [Member] | Collateralized debt obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	33,406,000	49,923,000
Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	63,308,000	70,263,000
Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	24,983,000	14,326,000
Financial Instruments Owned [Member] | Other asset-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	21,571,000	21,463,000
Financial Instruments Owned [Member] | Loans and other receivables [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments owned, fair value	103,059,000	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]
Instruments owned, fair value	8,204,000	7,693,000
Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Instruments sold, not yet purchased, fair value	20,735,000	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]
Instruments sold, not yet purchased, fair value	$ 1,896,000	$ 10,469,000
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Commodity Forwards [Member] | Market approach [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		$ 9,500,000
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Commodity Forwards [Member] | Market approach [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Discount rate/yield		0.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Commodity Forwards [Member] | Comparable pricing [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	$ 783
Level 3 [Member] | Financial Instruments Owned [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), Constant default rate/Credit spread		2.98%
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Unfunded commitment [Member] | Comparable pricing [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		$ 100
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Total return swaps [Member] | Comparable pricing [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	86	91.7
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Total return swaps [Member] | Comparable pricing [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	100	92.4
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Total return swaps [Member] | Comparable pricing [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	$ 95	$ 92.1
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	2.90%
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Interest rate swaps [Member] | Market approach [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant default rate/Credit spread	6.70%
Level 3 [Member] | Financial Instruments Owned [Member] | Derivatives [Member] | Interest rate swaps [Member] | Market approach [Member] | Maximum [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] | Derivatives [Member] | Interest rate swaps [Member] | Market approach [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant default rate/Credit spread	7.10%
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Market approach [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Underlying stock price (in dollars per share)	$ 1
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Market approach [Member] | Maximum [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] | Market approach [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), EBITDA multiple		4.4
Significant Unobservable Input(s), Transaction level (in dollars per share)	$ 2	$ 1
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), EBITDA multiple	5.0
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] | Market approach [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), EBITDA multiple	16.0
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] | Market approach [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), EBITDA multiple	12.3
Significant Unobservable Input(s), Underlying stock price (in dollars per share)	$ 21	19
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)	$ 4
Significant Unobservable Input(s), Discount rate/yield	65.00%
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)		$ 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	10.00%	86.00%
Significant Unobservable Input(s), Volatility	40.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Comparable pricing [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Discount rate/yield	91.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate debt securities [Member] | Scenario analysis [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Estimated recovery percentage	6.30%
Level 3 [Member] | Financial Instruments Owned [Member] | Collateralized debt obligations [Member] | Discounted cash flows [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate	10.00%	5.00%
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	5.00%	6.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Collateralized debt obligations [Member] | Discounted cash flows [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate	20.00%	20.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	8.00%	8.00%
Significant Unobservable Input(s), Loss severity	70.00%	90.00%
Significant Unobservable Input(s), Yield	22.00%	13.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Collateralized debt obligations [Member] | Discounted cash flows [Member] | Weighted Average [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	3.00%	2.00%
Significant Unobservable Input(s), Loss severity	30.00%	52.00%
Significant Unobservable Input(s), Yield	17.00%	10.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member] | Discounted cash flows [Member] | Minimum [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	15.00%	25.00%
Significant Unobservable Input(s), Yield	1.00%	1.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member] | Discounted cash flows [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate	50.00%	50.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	50.00%	9.00%
Significant Unobservable Input(s), Loss severity	85.00%	70.00%
Significant Unobservable Input(s), Yield	9.00%	9.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member] | Discounted cash flows [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate	15.00%	13.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	5.00%	3.00%
Significant Unobservable Input(s), Loss severity	45.00%	39.00%
Significant Unobservable Input(s), Yield	5.00%	6.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member] | Discounted cash flows [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Yield	7.00%	7.00%
Significant Unobservable Input(s), Cumulative loss rate	1.00%	2.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member] | Discounted cash flows [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Yield	17.00%	30.00%
Significant Unobservable Input(s), Cumulative loss rate	71.00%	63.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member] | Discounted cash flows [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Yield	11.00%	16.00%
Significant Unobservable Input(s), Cumulative loss rate	17.00%	23.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Discounted cash flows [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate	0.00%	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	3.00%	7.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Discounted cash flows [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate	30.00%	8.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	30.00%	5.00%
Significant Unobservable Input(s), Loss severity	100.00%	75.00%
Significant Unobservable Input(s), Yield	22.00%	22.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Discounted cash flows [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate	17.00%	7.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	10.00%	4.00%
Significant Unobservable Input(s), Loss severity	67.00%	62.00%
Significant Unobservable Input(s), Yield	11.00%	18.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Over collateralization percentage [Member] | Minimum [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] | Over collateralization percentage [Member] | Maximum [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] | Over collateralization percentage [Member] | Weighted Average [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), EBITDA multiple		10.0
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), Discount rate/yield	2.00%
Significant Unobservable Input(s), 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), Discount rate/yield	10.00%
Significant Unobservable Input(s), Yield		17.00%
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), Discount rate/yield	8.00%
Significant Unobservable Input(s), Yield		12.00%
Level 3 [Member] | Financial Instruments Owned [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 bond or loan price	$ 99
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Comparable pricing [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		$ 99
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Comparable pricing [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		100
Level 3 [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Comparable pricing [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		$ 99.7
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	6.00%	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	100.00%	100.00%
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	56.00%	83.00%
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), Transaction level (in dollars per share)	$ 74	$ 64
Significant Unobservable Input(s), Enterprise value	$ 5,200,000	$ 5,200,000
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Commercial Loan [Member] | Comparable pricing [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		$ 100
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Commercial Loan [Member] | Scenario analysis [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Estimated recovery percentage	14.00%
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%	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%	0.00%
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), Discount rate/yield	4.00%	3.00%
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), Discount rate/yield	52.00%	10.00%
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), Discount rate/yield		10.00%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [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		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] | Derivatives [Member] | Unfunded commitment [Member] | Comparable pricing [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	$ 99
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [Member] | Comparable pricing [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		$ 79
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [Member] | Comparable pricing [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		100
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Unfunded commitment [Member] | Comparable pricing [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		82.6
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Total return swaps [Member] | Market approach [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	86
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Total return swaps [Member] | Market approach [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	100
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Total return swaps [Member] | Comparable pricing [Member] | Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		91.7
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Total return swaps [Member] | Comparable pricing [Member] | Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		92.4
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Total return swaps [Member] | Comparable pricing [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	$ 95	$ 92.1
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member] | Variable funding note 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	5.00%
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), 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	13.00%