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Organization - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2012
Property
State
Dec. 31, 2012
Property
State
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2012
Apr. 29, 2011
Property
Jun. 10, 2011
Minimum
Jun. 10, 2011
Maximum
Dec. 31, 2012
Subsidiaries
Apr. 30, 2009
Common Stock
Subsidiaries
Jan. 04, 2012
Series A cumulative Non-Voting Preferred stock
Dec. 31, 2012
Series A cumulative Non-Voting Preferred stock
Person
Class of Stock [Line Items]                          
Common stock sold                     20,000   125
Date of wholly owned subsidiary common stock     Jan. 20, 2011                    
Common stock, shares authorized               250,000          
Common stock, shares authorized                 100,000,000        
Common stock for sale to public per share subject to discounts $ 10.00                        
Common stock for sale to public per share pursuant to distribution reinvestment plan $ 9.50                        
Number of shares issued to RAIT NTR Holdings, LLC           300,000              
Additional shares   25,000               300,000      
Minimum offering amount   $ 3,000 $ 3,193 $ 0 $ 0         $ 3,000      
Date of common stock sold to Independence Realty Advisors, LLC.     Jan. 04, 2012                    
Preferred stock designated                       12.50% 12.50%
Number of accredited investors not affiliated by the parent company                         125
Number of multifamily property owned   8 8                    
Number of units located with multifamily properties   2,004 2,004       6            
Number of states in which multifamily properties located   6 6