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Organization - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Jun. 30, 2011
Dec. 31, 2012
State
Property
Mar. 31, 2012
Sep. 30, 2013
State
Property
Sep. 30, 2012
Dec. 31, 2012
State
Property
Dec. 31, 2011
Dec. 31, 2010
Apr. 29, 2011
Property
Dec. 31, 2012
Subsidiaries
Apr. 30, 2009
Common Stock
Subsidiaries
Jan. 04, 2012
Series Cumulative Non-Voting Preferred Stock
Dec. 31, 2012
Series Cumulative Non-Voting Preferred Stock
Person
Aug. 13, 2013
Public Offering
Jun. 10, 2011
Minimum
Jun. 10, 2011
Maximum
Class of Stock [Line Items]                                
Common stock, shares authorized                             250,000  
Common stock, shares authorized                           4,000,000   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                          
Gross Proceeds from offering   $ 3,000,000 $ 3,000,000 $ 31,461,000 $ 3,015,000 $ 3,193,000 $ 0 $ 0   $ 3,000,000       $ 34,000,000    
Common stock offering price                           $ 8.50    
Additional shares   25,000               300,000       600,000    
Net Proceeds from offering                           $ 31,100,000    
Number of multifamily property owned   8   9   8                    
Number of units located with multifamily properties   2,004   2,358   2,004     6              
Number of states in which multifamily properties located   6   6   6                    
Common stock sold                     20,000   125      
Date of wholly owned subsidiary common stock           Jan. 20, 2011                    
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