Derivative Financial Instruments - Unrealized and Realized Gains (Losses) on Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	$ (73,575)	$ 44,653
Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	(208)	38,936
Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	5,437	11,895
Equity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	(91,101)	(22,021)
Commodity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	16,186	19,585
Credit contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	$ (3,889)	$ (3,742)