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Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to deliver $ 1,858,962 $ 660,995
Receivables from clearing organizations 137,565 269,549
Other receivables from broker-dealers and customers 8,126 7,561
Net pending trades   1,782
Open derivative contracts 2,953 1,979
Total 2,007,606 941,866
Payables to broker-dealers, clearing organizations, customers and related broker-dealers:    
Contract values of fails to receive 1,669,191 636,705
Payables to clearing organizations 106,604 30,043
Other payables to broker-dealers and customers 18,853 11,956
Net pending trades 7,820  
Open derivative contracts 2,536 91,129
Total $ 1,805,004 $ 769,833