| Floor Brokerage, Exchange and Clearance Fees | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Floor Brokerage, Exchange and Clearance Fees, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |