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		9 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Financial instruments owned:
Loans and other receivables	$ (24,874)	$ (13,566)	$ (48,658)	$ (25,686)
Long-term Debt [Member]
Financial Instruments Sold and Long-term Debt
Loans, Loan commitments and Changes in instrument specific credit risk	(4,093)	0	(7,848)	0
Other changes in fair value	3,225	0	13,530	0
Loans [Member]
Financial Instruments Sold and Long-term Debt
Loans, Loan commitments and Changes in instrument specific credit risk	212	38	229	112
Loan commitments [Member]
Financial Instruments Sold and Long-term Debt
Loans, Loan commitments and Changes in instrument specific credit risk	$ 4,769	$ (51)	$ 2,196	$ (1,673)