Fair Value Disclosures - Quantitative Information about Significant Unobservable Inputs Used in Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Feb. 28, 2015	Nov. 30, 2014	Feb. 28, 2014	Nov. 30, 2013
Embedded conversion option [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Sold, Not Yet Purchased	825	693	$ 7,607	$ 9,574
Financial Instruments Owned [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	46,136	54,190
Financial Instruments Owned [Member] | Corporate equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	18,210	19,814
Financial Instruments Owned [Member] | Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	24,795	22,766
Financial Instruments Owned [Member] | Collateralized debt obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	51,095	41,784
Financial Instruments Owned [Member] | Residential mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	79,953	82,557
Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	24,629	26,655
Financial Instruments Owned [Member] | Other asset-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	7,146	2,294
Financial Instruments Owned [Member] | Loans and other receivables [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Owned	102,034	88,154
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]
Market Value of Financial Instruments Owned	9,179	8,500
Financial Instruments Sold, Not Yet Purchased [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Sold, Not Yet Purchased	49,450
Financial Instruments Sold, Not Yet Purchased [Member] | Embedded conversion option [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Sold, Not Yet Purchased	825	693
Financial Instruments Sold, Not Yet Purchased [Member] | Equity options [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Sold, Not Yet Purchased		49,552
Financial Instruments Sold, Not Yet Purchased [Member] | Commercial Loan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Sold, Not Yet Purchased		14,450
Financial Instruments Sold, Not Yet Purchased [Member] | Loans and other receivables [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Sold, Not Yet Purchased	9,327
Financial Instruments Sold, Not Yet Purchased [Member] | Other secured financings at fair value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Market Value of Financial Instruments Sold, Not Yet Purchased	65,602	30,825
Level 3 [Member] | Financial Instruments Owned [Member] | Discounted cash flows [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Discount rate/yield	20.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Comparable pricing [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Yield	8.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Minimum [Member] | Option model [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Volatility	12.00%	13.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Maximum [Member] | Option model [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Volatility	23.00%	23.00%
Level 3 [Member] | Financial Instruments Owned [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 bond or loan price	99.0
Level 3 [Member] | Financial Instruments Owned [Member] | Weighted Average [Member] | Option model [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Volatility	15.00%
Level 3 [Member] | Financial Instruments Owned [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 bond or loan price	71
Level 3 [Member] | Financial Instruments Owned [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 bond or loan price	100.0
Level 3 [Member] | Financial Instruments Owned [Member] | Loan commitments [Member] | Comparable pricing [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price		100.0
Level 3 [Member] | Financial Instruments Owned [Member] | Commodity forwards [Member] | Discounted cash flows [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Discount rate/yield		17.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Corporate equity securities [Member] | Scenario analysis [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Transaction level	0.78
Significant Unobservable Input(s), Volatility		24.00%
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), EBITDA multiple	3.5	3.4
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), EBITDA multiple	8.6	4.7
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), EBITDA multiple	4.4	3.6
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	32.00%	32.00%
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	0.00%	0.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	0.00%	0.00%
Significant Unobservable Input(s), Loss severity	0.00%	0.00%
Significant Unobservable Input(s), Yield	6.00%	2.00%
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%	20.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	2.00%	2.00%
Significant Unobservable Input(s), Loss severity	70.00%	70.00%
Significant Unobservable Input(s), Yield	20.00%	51.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Collateralized debt obligations [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%	13.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	2.00%	2.00%
Significant Unobservable Input(s), Loss severity	42.00%	39.00%
Significant Unobservable Input(s), Yield	13.00%	16.00%
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	2.00%	1.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	2.00%	1.00%
Significant Unobservable Input(s), Loss severity	35.00%	20.00%
Significant Unobservable Input(s), Yield	1.00%	3.00%
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	50.00%	50.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	100.00%	100.00%
Significant Unobservable Input(s), Loss severity	80.00%	80.00%
Significant Unobservable Input(s), Yield	13.00%	13.00%
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	13.00%	13.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	21.00%	14.00%
Significant Unobservable Input(s), Loss severity	52.00%	50.00%
Significant Unobservable Input(s), Yield	6.00%	7.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Commercial mortgage-backed securities [Member] | Scenario analysis [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Estimated recovery percentage	81.00%	90.00%
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	8.00%	8.00%
Significant Unobservable Input(s), Cumulative loss rate	2.00%	4.00%
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	22.00%	12.00%
Significant Unobservable Input(s), Cumulative loss rate	73.00%	72.00%
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	14.00%	11.00%
Significant Unobservable Input(s), Cumulative loss rate	16.00%	15.00%
Level 3 [Member] | Financial Instruments Owned [Member] | Other asset-backed securities [Member] | Discounted cash flows [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant prepayment rate		8.00%
Significant Unobservable Input(s), Constant default rate/Credit spread		3.00%
Significant Unobservable Input(s), Loss severity		70.00%
Significant Unobservable Input(s), Yield		7.00%
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%
Significant Unobservable Input(s), Constant default rate/Credit spread	3.00%
Significant Unobservable Input(s), Loss severity	50.00%
Significant Unobservable Input(s), Yield	6.00%
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	6.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	4.00%
Significant Unobservable Input(s), Loss severity	60.00%
Significant Unobservable Input(s), Yield	7.00%
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	4.00%
Significant Unobservable Input(s), Constant default rate/Credit spread	4.00%
Significant Unobservable Input(s), Loss severity	52.00%
Significant Unobservable Input(s), Yield	6.00%
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	8.2
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), 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 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), EBITDA multiple		3.4
Significant Unobservable Input(s), Yield	3.00%	3.00%
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 bond or loan price	100.0	100.0
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	10.00%	10.00%
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), EBITDA multiple		8.2
Significant Unobservable Input(s), Yield	9.00%	5.00%
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 bond or loan price	100.9	101.0
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	81.00%	41.00%
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), EBITDA multiple		7.6
Significant Unobservable Input(s), Yield	7.00%	4.00%
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 bond or loan price	100.5	100.3
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%	36.00%
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	57	50
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Market approach [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Yield		5.00%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Comparable pricing [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Constant default rate/Credit spread		0.45%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Option valuation model [Member] | Embedded conversion option [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Historical volatility	20.00%	18.90%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Minimum [Member] | Market approach [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Yield	5.00%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Minimum [Member] | Option model [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Volatility	12.00%	13.00%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Maximum [Member] | Market approach [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Yield	8.00%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Maximum [Member] | Option model [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Volatility	23.00%	23.00%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [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), Yield	8.00%
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Weighted Average [Member] | Option model [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Volatility		17.00%
Significant Unobservable Input(s), Volatility (USD per share)	0.15
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] | Comparable pricing [Member] | Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Input(s), Comparable bond or loan price	71	89
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 bond or loan price	100.0	100.0
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 bond or loan price	78.6	92.0
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	100.0	100.0
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Other secured financings at fair value [Member] | Minimum [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	82	81
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Other secured financings at fair value [Member] | Maximum [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	100.0	100.0
Level 3 [Member] | Financial Instruments Sold, Not Yet Purchased [Member] | Other secured financings at fair value [Member] | Weighted Average [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	98.9	98.7