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Regulatory Requirements (Detail) (USD $) In Millions	Jun. 30, 2011
Regulatory Requirements [Line Items]
Minimum net capital requirement	$ 2.5
Net capital early warning threshold	3
Regulatory net capital	260.8
Regulatory net capital, excess net capital	$ 258.3

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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