| Cash and Securities Segregated under Commodity Exchange Act Regulation | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Cash and Securities Segregated under Commodity Exchange Act Regulation, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Cash and securities deposited in a special reserve account for the exclusive benefit of customers pursuant to the Commodity Exchange Act. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |