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	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Financial instruments owned:
Loans and other receivables	$ (68,812)	$ (17,389)	$ (24,785)
Loans [Member]
Financial Instruments Sold:
Gains (losses) due to changes in instrument specific credit risk	9	(162)	(585)
Loan commitments [Member]
Financial Instruments Sold:
Gains (losses) due to changes in instrument specific credit risk	5,509	7,502	(15,459)
Long-term Debt [Member]
Financial Instruments Sold:
Gains (losses) due to changes in instrument specific credit risk	(10,745)	0	0
Other changes in fair value	$ 30,995	$ 0	$ 0