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, 2013		Nov. 30, 2012
Financial Instruments Owned:
Loans and other receivables	$ (258,406)	[1]	$ (256,271)	[1]
Loans greater than 90 days past due			$ 10,433	[1],[2]

[1] Interest income is recognized separately from other changes in fair value and is included within Interest revenues on the Consolidated Statements of Earnings.

[2] The aggregate fair value of loans that were 90 or more days past due was $- 0 - million and $34.7 million at February 28, 2013 and November 30, 2012.