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Commission Management Payable
9 Months Ended
Sep. 30, 2018
Commission Management Payable [Abstract]  
Commission Management Payable
Commission Management Payable
The Company receives a gross commission from various clearing brokers, which is then used to fund commission sharing and recapture arrangements, less the portion retained as income to the Company. Accrued commission sharing and commission recapture payable of $90.2 million as of September 30, 2018 and $70.5 million as of December 31, 2017 are classified as commission management payable in the accompanying condensed consolidated statements of financial condition.