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Net Capital Requirements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
JVB [Member]
Net Capital Requirements [Line Items]
Adjusted net capital	$ 10,833	$ 9,558
Amount in excess of minimum capital requirement	10,689	9,426
PrinceRidge [Member]
Net Capital Requirements [Line Items]
Adjusted net capital	17,846	4,606
Amount in excess of minimum capital requirement	17,596	4,356
Cohen and Company Financial Limited [Member]
Net Capital Requirements [Line Items]
Minimum net liquid capital required	2,887	1,820
Net liquid capital	5,864	4,881
Amount in excess of minimum capital	$ 2,977	$ 3,061

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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