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Organization - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2013
Property
State
Mar. 31, 2012
Jun. 30, 2013
Property
State
Jun. 30, 2012
Jun. 10, 2011
Minimum
Jun. 10, 2011
Maximum
Aug. 13, 2013
Subsequent Event
Public Offering
Apr. 30, 2009
Common Stock
Subsidiaries
Jan. 04, 2012
Series Cumulative Non-Voting Preferred Stock
Jun. 30, 2013
Series 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 in offering             100,000,000 4,000,000      
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   12,000           600,000      
Gross Proceeds from offering     $ 3,000 $ 207 $ 2,970     $ 34,000      
Common stock offering price               $ 8.50      
Net Proceeds from offering               $ 31,100      
Date of common stock sold to Independence Realty Advisors, LLC.       Jan. 04, 2012              
Preferred stock designated                   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              
Number of states in which multifamily properties located   6   6