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Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to deliver $ 964,608 $ 186,799
Customer receivables 149,418 51,991
Cash and cash equivalents held at clearing organizations 55,813 45,563
Other receivables from broker-dealers and customers 16,762 11,587
Net pending trades 5,552 966
Open derivative contracts 601 782
Total 1,192,754 297,688
Payables to broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to receive 1,023,305 209,321
Customer payables 123,311 19,716
Payables to clearing organizations 6,324 1,632
Other payables to broker-dealers and customers 35,088 23,282
Open derivative contracts 1,472 338
Total $ 1,189,500 $ 254,289