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Organization - Additional Information (Detail) $ / shares in Units, $ in Billions | Sep. 17, 2015 USD ($) $ / shares shares | Sep. 30, 2015 Property
--- | --- | ---
Class Of Stock [Line Items] |  |
Number of units located with multifamily properties | Property |  | 14,044
Number of multifamily properties owned | Property |  | 50
Trade Street Residential, Inc. |  |
Class Of Stock [Line Items] |  |
Common stock shares converted into right to receive cash | $ / shares | $ 3.80 |
Common stock shares converted into right to receive shares of IRT | 0.4108 |
Shares issued to acquire entity | 15,110,994 |
Trade Street Residential, Inc. | Limited Partner |  |
Class Of Stock [Line Items] |  |
Operating partnership units exchanged in merger | 1,925,419 |
Minimum |  |
Class Of Stock [Line Items] |  |
Expected total capitalization after merger | $ | $ 1.4 |

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