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Related Party Transactions (Details)
1 Months Ended 3 Months Ended 12 Months Ended 25 Months Ended
Feb. 28, 2017
USD ($)
Sep. 30, 2016
Jun. 30, 2016
USD ($)
lot
townhome
Mar. 31, 2018
USD ($)
board_seat
Dec. 31, 2017
USD ($)
lot
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
lot
Dec. 31, 2015
USD ($)
Mar. 31, 2018
USD ($)
board_seat
Mar. 31, 2016
lot
townhome
Sep. 30, 2015
lot
townhome
Related Party Transaction [Line Items]                      
Ownership percentage by parent       50.00%         50.00%    
Ownership percentage by noncontrolling owners       50.00%         50.00%    
Percentage of voting interest       51.00%         51.00%    
Noncontrolling interests       $ 10,682,000 $ 16,691,000 [1]   $ 16,691,000 [1]   $ 10,682,000    
Board seats held | board_seat       2         2    
Board seats available | board_seat       3         3    
Suwanee Station                      
Related Party Transaction [Line Items]                      
Board seats held | board_seat       2         2    
Board seats available | board_seat       3         3    
Centre Living                      
Related Party Transaction [Line Items]                      
Ownership percentage by parent       50.00%         50.00%    
Ownership percentage by noncontrolling owners       50.00%         50.00%    
Percentage of voting interest       51.00%         51.00%    
Percent of centre living operations consolidated       100.00%              
Noncontrolling interests       $ 115,740 56,445   56,445   $ 115,740    
Centre Living | Richard A. Costello                      
Related Party Transaction [Line Items]                      
Proceeds from sale of developed lot         525,000            
Related party deposit liabilities $ 110,000                    
Centre Living | Jed Dolson                      
Related Party Transaction [Line Items]                      
Proceeds from sale of developed lot         475,000            
Related party deposit liabilities $ 110,000                    
Centre Living | Developed Lots                      
Related Party Transaction [Line Items]                      
Number of real estate properties | lot     1                
Proceeds from sale of developed lot     $ 400,000                
Cost of developed lot sold     $ 300,000                
Contract price employee discount premium   13.00%                  
Development in Process         $ 600,000   $ 600,000        
Investee | The Parc at Cogburn                      
Related Party Transaction [Line Items]                      
Number of real estate properties | lot                     11
Number of units in real estate property | townhome                     19
Payments to acquire real estate           $ 500,000   $ 1,800,000      
Number of lots remaining to be purchased | lot         0   0        
Investee | Academy Street                      
Related Party Transaction [Line Items]                      
Ownership percentage by parent                   80.00%  
Ownership percentage by noncontrolling owners                   20.00%  
Number of real estate properties | lot                   83  
Capital contributions made       0   $ 400,000     11,700,000    
Payment for capital contributions, percent paid by the Company           80.00%          
Distributions received           $ 4,000,000          
Investee | Academy Street | Partnership Distributions                      
Related Party Transaction [Line Items]                      
Total distributions       0   5,000,000          
Investee | Suwanee Station                      
Related Party Transaction [Line Items]                      
Number of real estate properties | townhome                   73  
Capital contributions made       0   0     $ 2,500,000    
Distributions received       300,000   200,000          
Investee | Suwanee Station | Parent Company                      
Related Party Transaction [Line Items]                      
Ownership percent                   50.00%  
Investee | Suwanee Station | Affiliated Entity                      
Related Party Transaction [Line Items]                      
Ownership percent                   50.00%  
Investee | Suwanee Station | Partnership Distributions                      
Related Party Transaction [Line Items]                      
Total distributions       $ 700,000   400,000          
Investee | Dunwoody Towneship                      
Related Party Transaction [Line Items]                      
Number of real estate properties | lot     14   26   26        
Number of units in real estate property | townhome     40                
Payments to acquire real estate           $ 700,000 $ 3,300,000        
Deposit paid for purchase of real estate     $ 0                
Chief Financial Officer | Townhome                      
Related Party Transaction [Line Items]                      
Contract price employee discount premium 13.00%                    
Named Executive Officers | Townhome                      
Related Party Transaction [Line Items]                      
Contract price employee discount premium 13.00%                    
[1] The Condensed Consolidated Balance Sheet at December 31, 2017 has been derived from the audited financial statements at that date, but does not include all of the footnotes required by U.S. generally accepted accounting principles for complete financial statements.