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	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Financial instruments owned:
Loans and other receivables	$ (5,294)	$ 2,038	$ (2,377)	$ 1,430
Loans [Member]
Financial Instruments Sold:
Loan commitments	110	(1,555)	238	(2,591)
Loan commitments [Member]
Financial Instruments Sold:
Loan commitments	$ 5,544	$ (9,024)	$ (1,622)	$ (11,090)