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
	Feb. 28, 2017	Feb. 29, 2016
Financial instruments owned:
Loans and other receivables	$ (5,127)	$ (15,462)
Long-term debt [Member]
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	(16,040)	(302)
Other changes in fair value	3,417	6,858
Loans [Member]
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	(27)	48
Loan commitments [Member]
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	$ 871	$ (3,746)