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Capital and Reserve Requirement Information - Aggregate Indebtedness, Net Capital and Resultant Ratio for VPD (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Compliance With Regulatory Capital Requirements Under Brokers And Dealers [Line Items]
Aggregate indebtedness	$ 23,443	$ 17,527	$ 19,315
Net capital	$ 16,617	$ 10,874	$ 4,812
Ratio of aggregate indebtedness to net capital	1.4	1.6	4.0

Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.

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