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Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to deliver $ 2,422,519 $ 586,486
Receivables from clearing organizations 240,573 133,682
Other receivables from broker-dealers and customers 9,243 10,968
Net pending trades 3,299 1,597
Open derivative contracts 94,744 12,669
Total 2,770,378 745,402
Payables to broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to receive 2,278,786 567,460
Payables to clearing organizations 149,444 14,023
Other payables to broker-dealers and customers 13,172 18,164
Open derivative contracts 63,796 7,933
Total $ 2,505,198 $ 607,580