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Business Combinations and Divestitures - Summary of Consideration Received and Gain on Sale (Details) - USD ($)
 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Business Acquisition [Line Items]    
Gain on sale of subsidiary, net of transaction costs   $ 20,860,000
Triumph Capital Advisors, LLC    
Business Acquisition [Line Items]    
Cash $ 10,554,000  
Loan receivable 10,500,000  
Revenue share 1,623,000  
Total consideration received 22,677,000  
Carrying value of TCA membership interest 1,417,000  
Gain on sale of subsidiary 21,260,000  
Transaction costs 400,000  
Gain on sale of subsidiary, net of transaction costs $ 20,860,000