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Summary of Significant Accounting Policies (Details)
$ in Thousands
6 Months Ended 12 Months Ended 15 Months Ended
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
segment
Mar. 31, 2016
USD ($)
item
Oct. 07, 2013
Significant Accounting Policies [Line Items]          
Number of reportable segments | segment 1   2    
Number of brokerages having assets and liabilities sold | item       21  
Increase in cash flows provided by operating activities $ 27,032 $ 36,567      
Decrease in cash flows used in financing activities 28,241 $ 62,325      
Impact of debt issuance costs related to debt liability     $ 1,527    
Early adoption of accounting pronouncement          
Significant Accounting Policies [Line Items]          
Cumulateve effect adjustment to retained earnings 44        
Increase in cash flows provided by operating activities 2,361        
Decrease in cash flows used in financing activities 2,361        
Income tax benefit relating to the exercise of stock options and vesting of restricted stock units $ 201        
Deferred tax assets, net       $ 3,332  
RMCO, LLC          
Significant Accounting Policies [Line Items]          
Minority economic interest in RMCO (as a percent) 58.42%       39.56%