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	Sep. 30, 2016	Dec. 31, 2015
Receivable from brokers, dealers and clearing organizations consist of:
Securities borrowed	$ 155,725	$ 224,672
Receivable from brokers	27,691	49,458
Securities failed to deliver	16,782	7,799
Clearing organizations	16,399	25,030
Other	39,221	58,832
Receivables from brokers, dealers and clearing organizations	255,818	365,791
Payable to brokers, dealers and clearing organizations consist of:
Securities loaned	133,205	130,658
Payable to brokers	6,626	3,316
Securities failed to receive	13,862	21,513
Other	475	9,059
Payable to brokers, dealers and clearing organizations	$ 154,168	$ 164,546