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Receivables from and Payables to Brokers, Dealers, and Clearing Agencies - Schedule of Receivables from Brokers, Dealers, and Clearing Agencies (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Receivable and Payable [Line Items]    
Receivable from clearing organizations $ 1,084 $ 51,619
Unsettled regular way trades, net 9,653 17,232
Deposits with clearing organizations 1,516 2,112
Receivables from brokers, dealers, and clearing agencies 12,253 70,963
Margin payable 96,211 24,633
Payables to brokers, dealers, and clearing agencies $ 96,211 $ 24,633