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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 3 Months Ended 12 Months Ended
Jun. 30, 2011
Mar. 31, 2013
State
Property
Dec. 31, 2012
State
Property
Mar. 31, 2012
Dec. 31, 2012
State
Property
Dec. 31, 2011
Dec. 31, 2010
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 Cumulative Non-Voting Preferred Stock
Mar. 31, 2013
Series Cumulative Non-Voting Preferred Stock
Person
Dec. 31, 2012
Series Cumulative Non-Voting Preferred Stock
Person
Class of Stock [Line Items]                              
Common stock sold                       20,000   125 125
Date of wholly owned subsidiary common stock   Jan. 20, 2011     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 25,000               300,000        
Minimum offering amount   $ 102 $ 3,000 $ 3,000 $ 3,193 $ 0 $ 0       $ 3,000        
Date of common stock sold to Independence Realty Advisors, LLC.   Jan. 04, 2012     Jan. 04, 2012                    
Preferred stock designated                         12.50%   12.50%
Number of accredited investors not affiliated by the parent company                           125 125
Number of multifamily property owned   8 8   8                    
Number of units located with multifamily properties   2,004 2,004   2,004     6              
Number of states in which multifamily properties located   6 6   6