Fair Value Disclosures - Summary of Amount by Which Contractual Principal Exceeds Fair Value for Loans and Other Receivables Measured at Fair Value under Fair Value Option (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Nov. 30, 2014
Financial instruments owned:
Loans and other receivables	$ 426,425	$ 403,119
Loans and other receivables greater than 90 days past due	28,829	5,594
Loans and other receivables on nonaccrual status	$ (36,471)	$ (22,360)