Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2014	Nov. 30, 2013
Collateralized Securities Transactions [Abstract]
Securities borrowing arrangements	$ 4,358,700	$ 3,818,400
Securities borrowing arrangements, collateral	4,242,400	3,721,800
Securities borrowing arrangements, repurchase agreements	431,000	1,410,000
Securities borrowing arrangements, pledged securities collateral	$ 448,400	$ 1,438,900