Fair Value Disclosures - Summary of Gains (Losses) Due to Changes in Instrument Specific Credit Risk for Loans and Other Receivables and Loan Commitments Measured at Fair Value under Fair Value Option (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2015	Feb. 28, 2014
Financial instruments owned:
Loans and other receivables	$ 5,389	$ 4,467
Loans [Member]
Financial Instruments Sold:
Loan commitments	(1,022)	(462)
Loan commitments [Member]
Financial Instruments Sold:
Loan commitments	$ (7,166)	$ (2,357)