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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 |
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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 |  |  |

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