Fair Value Disclosures - Summary of Valuation Bases (Pricing Information) for Financial Instruments (Detail)	Feb. 28, 2014	Nov. 30, 2013
Financial Instruments Owned And Sold Not Yet Purchased Measured Using Different Valuation Basis [Line Items]
Financial Instruments Owned	100.00%	100.00%
Financial Instruments Sold, Not Yet Purchased	100.00%	100.00%
Exchange closing prices [Member]
Financial Instruments Owned And Sold Not Yet Purchased Measured Using Different Valuation Basis [Line Items]
Financial Instruments Owned	12.00%	12.00%
Financial Instruments Sold, Not Yet Purchased	16.00%	25.00%
Recently observed transaction prices [Member]
Financial Instruments Owned And Sold Not Yet Purchased Measured Using Different Valuation Basis [Line Items]
Financial Instruments Owned	6.00%	5.00%
Financial Instruments Sold, Not Yet Purchased	5.00%	4.00%
External pricing services [Member]
Financial Instruments Owned And Sold Not Yet Purchased Measured Using Different Valuation Basis [Line Items]
Financial Instruments Owned	68.00%	68.00%
Financial Instruments Sold, Not Yet Purchased	74.00%	66.00%
Broker quotes [Member]
Financial Instruments Owned And Sold Not Yet Purchased Measured Using Different Valuation Basis [Line Items]
Financial Instruments Owned	3.00%	3.00%
Financial Instruments Sold, Not Yet Purchased	3.00%	3.00%
Valuation techniques [Member]
Financial Instruments Owned And Sold Not Yet Purchased Measured Using Different Valuation Basis [Line Items]
Financial Instruments Owned	11.00%	12.00%
Financial Instruments Sold, Not Yet Purchased	2.00%	2.00%