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Subsequent Events (Details) - USD ($)
Feb. 26, 2018
Feb. 09, 2018
Nov. 15, 2017
Sep. 30, 2017
Dec. 31, 2016
Purchase Price Allocation          
Goodwill       $ 123,013,000 $ 126,633,000
Re/Max Of Northern Illinois Inc. | Subsequent Event          
Purchase Price Allocation          
Franchise agreements     $ 23,500,000    
Goodwill     12,220,000    
Total purchase price     35,720,000    
Cash consideration     $ 35,720,000    
Booj | Subsequent Event          
Purchase Price Allocation          
Cash consideration $ 26,250,000        
Booj | Subsequent Event | Maximum          
Purchase Price Allocation          
Equity-based compensation $ 10,000,000        
Former President | Subsequent Event          
Purchase Price Allocation          
Accrued costs under Separation Agreement   $ 1,900,000      
The period for payment of costs incurred under the Separation Agreement   39 months