Customer Concentration	3 Months Ended
Customer Concentration	Mar. 31, 2014
Risks And Uncertainties [Abstract]
Customer Concentration	13. Customer Concentration During both the three months ended March 31, 2014 and 2013, no single client accounted for more than 10% of total revenue. One client accounted for 13.6% and 12.7% of trading volumes during the three months ended March 31, 2014 and 2013, respectively.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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