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Collateralized Transactions - Additional Information (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Collateralized Securities Transactions [Line Items]
Reverse repurchase agreements	$ 49,063,000
Securities Financing Transaction, Fair Value [Member]
Collateralized Securities Transactions [Line Items]
U.S. Treasury securities	$ 49,100,000

Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement and assets not subject to a master netting arrangement.

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