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, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Financial instruments owned:
Loans and other receivables	$ (4,282)	$ (10,564)	$ (11,094)	$ (24,901)
Long-term debt [Member]
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	(3,757)	(3,453)	(19,797)	(3,755)
Other changes in fair value	1,516	3,893	4,933	10,751
Loans [Member]
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	(1,734)	407	(1,761)	405
Loan commitments [Member]
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	$ 3,332	$ 1,173	$ 4,203	$ (2,573)