Derivative Financial Instruments - Unrealized and Realized Gains (Losses) on Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2015	Feb. 28, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	$ 51,869	$ (82,979)
Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	(42,793)	(5,118)
Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	15,172	6,067
Equity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	71,041	(96,236)
Commodity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	14,491	16,186
Credit contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	$ (6,042)	$ (3,878)