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	Jun. 30, 2016	Dec. 31, 2015
Receivable from brokers, dealers and clearing organizations consist of:
Securities borrowed	$ 216,419	$ 224,672
Receivable from brokers	42,763	49,458
Securities failed to deliver	17,541	7,799
Clearing organizations	24,669	25,030
Other	13,916	58,832
Receivables from brokers, dealers and clearing organizations	315,308	365,791
Payable to brokers, dealers and clearing organizations consist of:
Securities loaned	125,548	130,658
Payable to brokers	1,068	3,316
Securities failed to receive	23,491	21,513
Other	22,255	9,059
Payable to brokers, dealers and clearing organizations	$ 172,362	$ 164,546