Receivable from and Payable to Brokers, Dealers and Clearing Organizations - Schedule of Receivable from and Payable to Brokers, Dealers and Clearing Organization (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Receivable from brokers, dealers and clearing organizations consist of:
Securities borrowed	$ 190,963	$ 224,672
Receivable from brokers	36,059	49,458
Securities failed to deliver	10,914	7,799
Clearing organizations	22,957	25,030
Other	2,470	53,954
Receivables from brokers, dealers and clearing organizations	263,363	360,913
Payable to brokers, dealers and clearing organizations consist of:
Securities loaned	143,157	130,658
Payable to brokers	10,232	3,316
Securities failed to receive	24,781	21,513
Other	29,709	9,059
Payable to brokers, dealers and clearing organizations	$ 207,879	$ 164,546