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, 2016	May 31, 2015	May 31, 2016	May 31, 2015
Financial instruments owned:
Loans and other receivables	$ (10,564)	$ (5,294)	$ (24,901)	$ (2,377)
Long-term Debt [Member]
Financial Instruments Sold and Long-term Debt
Loans, Loan commitments and Changes in instrument specific credit risk	(3,453)	0	(3,755)	0
Other changes in fair value	3,489	0	10,305	0
Loans [Member]
Financial Instruments Sold and Long-term Debt
Loans, Loan commitments and Changes in instrument specific credit risk	407	110	405	238
Loan commitments [Member]
Financial Instruments Sold and Long-term Debt
Loans, Loan commitments and Changes in instrument specific credit risk	$ 1,173	$ 5,544	$ (2,573)	$ (1,622)