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Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to deliver $ 1,475,662 $ 344,962
Receivables from clearing organizations 157,117 135,175
Other receivables from broker-dealers and customers 7,920 13,993
Net pending trades 3,775  
Open derivative contracts 3,212 3,427
Total 1,647,686 497,557
Payables to broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to receive 1,414,785 301,873
Payables to clearing organizations 53,657 22,170
Other payables to broker-dealers and customers 12,355 19,581
Net pending trades   29,962
Open derivative contracts 7,351 1,566
Total $ 1,488,148 $ 375,152