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Stockholder Equity and Non-Controlling Interest - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Feb. 01, 2016
Sep. 17, 2015
Nov. 25, 2014
Jul. 21, 2014
Jan. 29, 2014
Aug. 19, 2013
Aug. 13, 2013
May. 07, 2013
Feb. 28, 2013
Jun. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 10, 2016
Dec. 30, 2014
Nov. 24, 2014
Aug. 28, 2014
May. 07, 2014
Jul. 25, 2013
Class Of Stock [Line Items]                                      
Share price                     $ 7.51 $ 9.31              
Preferred stock redemption price                         $ 137            
Preferred stock, shares outstanding                     0 0              
Limited partnership interest received in exchange for issuance of common stock                     52,937                
Non-controlling interest distribution rate               $ 2.78 $ 2.78                    
Preferred stock redemption price                                     $ 10
Subsidiaries                                      
Class Of Stock [Line Items]                                      
Limited partnership interest received in exchange for issuance of common stock               5,274,900                      
Walnut Hill                                      
Class Of Stock [Line Items]                                      
Number of limited units issued                                 137,361    
Limited units issued value                                 $ 1,377    
Bennington Pond                                      
Class Of Stock [Line Items]                                      
Number of limited units issued                               4,929      
Limited units issued value                               $ 48      
Carrington                                      
Class Of Stock [Line Items]                                      
Number of limited units issued                                   222,062  
Limited units issued value                                   $ 1,986  
Subsequent Event                                      
Class Of Stock [Line Items]                                      
Limited partnership interest received in exchange for issuance of common stock 204,115                                    
Exchange of units to common stock 204,113                                    
OP Units outstanding                           2,950,816          
Series A Preferred Stock                                      
Class Of Stock [Line Items]                                      
Share price                 1,000                    
Preferred stock rate                 $ 0.34722222                    
Preferred sock, percentage of annualized distribution rate           12.50%     12.50%                    
Preferred stock, distribution payment date                   Jun. 28, 2013                  
Preferred stock, shares redeemed           125                          
Preferred stock redemption price           $ 140                          
Preferred stock, shares outstanding           0                          
Series B Preferred Units                                      
Class Of Stock [Line Items]                                      
Preferred stock, shares redeemed           350                          
Preferred stock redemption price           $ 3,500             $ 3,500            
Preferred stock, shares outstanding           0                          
Common Shares                                      
Class Of Stock [Line Items]                                      
Issuance of shares                     15,105,669 22,098,536 4,023,577            
Exchange of units to common stock                     52,933   5,274,900            
Noncontrolling Interests | Walnut Hill                                      
Class Of Stock [Line Items]                                      
Number of limited units issued                                 137,361    
Limited units issued value                                 $ 1,377    
Noncontrolling Interests | Iron Rock Ranch                                      
Class Of Stock [Line Items]                                      
Number of limited units issued                       918,098     918,098        
Limited units issued value                       $ 8,550     $ 8,550        
Noncontrolling Interests | Bennington Pond                                      
Class Of Stock [Line Items]                                      
Number of limited units issued                               4,929      
Limited units issued value                               $ 48      
Noncontrolling Interests | Carrington                                      
Class Of Stock [Line Items]                                      
Number of limited units issued                                   222,062  
Limited units issued value                                   $ 1,986  
Noncontrolling Interests | Series B Preferred Units                                      
Class Of Stock [Line Items]                                      
Preferred stock redemption price                         $ 3,500            
Distributions declared for the months of January through March 2013                                      
Class Of Stock [Line Items]                                      
Non-controlling interest for months                     January through March 2013                
Non-controlling interest per unit per day                 $ 0.00163934                    
Distributions declared for the months of January through March 2013 | Common Shares                                      
Class Of Stock [Line Items]                                      
Common stock for months                     January through June 2013                
Dividend rate of common stock                 0.00163934                    
Distributions declared for the months of April through June 2013                                      
Class Of Stock [Line Items]                                      
Non-controlling interest for months                     April through June 2013                
Non-controlling interest per unit per day                 0.00171233                    
Distributions declared for the months of April through June 2013 | Common Shares                                      
Class Of Stock [Line Items]                                      
Common stock for months                     April through June 2013                
Dividend rate of common stock                 $ 0.00171233                    
If IROP elects to extend its maturity                                      
Class Of Stock [Line Items]                                      
Non-controlling interest for months                     July through September 2013                
Underwritten Public Offering                                      
Class Of Stock [Line Items]                                      
Issuance of shares     6,000,000 8,050,000 8,050,000   4,000,000                        
Share price     $ 9.60 $ 9.50 $ 8.30   $ 8.50                        
Proceeds from issuance of common stock, gross     $ 57,600 $ 76,475 $ 66,815   $ 34,000                        
Proceeds from issuance of common stock, net     $ 54,704 $ 72,002 $ 62,718                            
Trade Street Residential, Inc.                                      
Class Of Stock [Line Items]                                      
Merger completion date   Sep. 17, 2015                                  
Common stock shares converted into right to receive cash   $ 3.80                                  
Common stock shares converted into right to receive shares of IRT   0.4108                                  
Shares issued to acquire entity   15,110,994                                  
Share price                     $ 7.51                
OP Units outstanding                     3,154,931                
OP Units redemption value                     $ 23,694                
Trade Street Residential, Inc. | Limited Partner                                      
Class Of Stock [Line Items]                                      
Operating partnership units exchanged in merger   1,925,419                                  
OP Units value, exchanged in merger   $ 13,998