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Organization - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2011
Mar. 31, 2013
State
Property
Mar. 31, 2012
Jun. 10, 2011
Minimum
Jun. 10, 2011
Maximum
Apr. 30, 2009
Common Stock
Subsidiaries
Jan. 04, 2012
Series Cumulative Non-Voting Preferred Stock
Mar. 31, 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         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   11,300            
Minimum offering amount   $ 102 $ 3,000          
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            
Number of units located with multifamily properties   2,004            
Number of states in which multifamily properties located   6