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Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to deliver $ 1,459,054 $ 586,486
Receivables from clearing organizations 207,215 133,682
Other receivables from broker-dealers and customers 8,557 10,968
Net pending trades 4,905 1,597
Open derivative contracts 51,557 12,669
Total 1,731,288 745,402
Payables to broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to receive 1,416,572 567,460
Payables to clearing organizations 34,863 14,023
Other payables to broker-dealers and customers 13,351 18,164
Open derivative contracts 52,148 7,933
Total $ 1,516,934 $ 607,580