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Regulatory Requirements - Regulatory Requirements Uniform Net Capital Rule (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Regulatory Capital Requirements [Abstract]    
Net Capital $ 355,866 $ 354,029
Minimum Net Capital Requirement $ 56,261 $ 46,597
Ratio of Aggregate Indebtedness to Net Capital 2.37 1.97