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Investments in Real Estate - Additional Information (Detail) $ in Thousands |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 15, 2015 USD ($) | Sep. 17, 2015 USD ($) Property | May. 01, 2015 USD ($) Property | Sep. 30, 2015 USD ($) Property | Sep. 30, 2014 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Number of multifamily properties owned | Property |  |  |  | 50 |
Number of units located with multifamily properties | Property |  |  |  | 14,044 |
Acquisition of real estate properties |  |  |  | $ 24,746 | $ 178,158
Investments in real estate |  |  |  | $ 707,268 |
Indianapolis Indiana |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of multifamily property acquired | Property |  |  | 236 |  |
Acquisition of real estate properties |  |  | $ 25,250 |  |
Indianapolis Indiana | Real Estate Investment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Investments in real estate |  |  | $ 25,250 |  |
Trade Street Residential, Inc. |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of multifamily property acquired | Property |  | 4,989 |  |  |
Investments in real estate |  | $ 682,237 |  |  |
Number of properties acquired | Property |  | 19 |  |  |
Trade Street Residential, Inc. | Subsequent Event |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Parcel of land sold | $ 3,350 |  |  |  |

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