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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In January 2012, the Company entered into a definitive agreement to acquire Algorithmic Trading Management, LLC (“ATM”), a provider of global, multi-asset class algorithmic execution trading models. The transaction, which is subject to certain regulatory approvals and customary closing conditions, is expected to close in the second quarter of 2012. The Company has evaluated events through March 9, 2012 which is the date the consolidated financial statements were available to be issued and has determined that there were no additional subsequent events requiring adjustment or disclosure to the consolidated financial statements.