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, 2018	Feb. 28, 2017
Financial instruments owned:
Loans and other receivables	$ 2,628	$ (5,127)
Long-term debt
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	(16,202)	(16,040)
Other changes in fair value	41,154	3,417
Loans
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	250	(27)
Loan commitments
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	$ (129)	$ 871