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Investments in Real Estate - Additional Information (Detail) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 22, 2015 USD ($) Property | Oct. 15, 2015 USD ($) | Sep. 17, 2015 USD ($) Property | May 01, 2015 USD ($) Property | Jan. 31, 2018 USD ($) Property | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Number of multifamily properties owned | Property |  |  |  |  |  |  | 52 |  |
Investment in real estate |  |  |  |  |  |  | $ 0 | $ 60,786 |
Number of property acquired | Property |  |  |  |  |  |  | 2,340 |  |
Acquisition of real estate properties |  |  |  |  |  |  | $ 220,254 |  | $ 24,746
Net assets acquired |  |  |  |  |  |  | 86,723 |  |
Fair value of equity consideration transferred |  |  |  |  |  | $ 1,654 |  |  |
Gains (losses) on TSRE merger and property acquisitions |  |  | $ 64,604 |  |  |  |  | 732 | $ 64,604
Purchase Price |  |  |  |  |  |  | 243,585 |  |
Number of Multifamily Property Disposed | Property | 1 |  |  |  |  |  |  |  |
Sale Price of Real Estate Property | $ 33,600 |  |  |  |  |  | $ 86,800 | 88,000 |
Gain (loss) on sale of assets | $ 6,420 | $ 8 |  |  |  |  |  |  |
Parcel of land sold |  | $ 3,350 |  |  |  |  |  |  |
TSRE Properties |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Gains (losses) on TSRE merger and property acquisitions |  |  |  |  |  |  |  | $ 732 |
Trade Street Residential, Inc. |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Number of property acquired | Property |  |  | 4,989 |  |  |  |  |  |
Number of properties acquired | Property |  |  | 19 |  |  |  |  |  |
Net assets acquired |  |  | $ 328,240 |  |  |  |  |  |
Consideration transferred |  |  | 263,636 |  |  |  |  |  |
Cash consideration for merger |  |  | 139,781 |  |  |  |  |  |
Limited Partner | Trade Street Residential, Inc. |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Fair value of equity consideration transferred |  |  | 13,998 |  |  |  |  |  |
Common Shares | Trade Street Residential, Inc. |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Fair value of equity consideration transferred |  |  | $ 109,857 |  |  |  |  |  |
Indianapolis, IN |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Number of property acquired | Property |  |  |  | 236 |  |  |  |  |
Acquisition of real estate properties |  |  |  | $ 25,250 |  |  |  |  |
Indianapolis, IN and Atlanta, GA | Creekside and Hartshire | Subsequent Event |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Number of property acquired | Property |  |  |  |  | 716 |  |  |  |
Purchase Price |  |  |  |  | $ 71,498 |  |  |  |
Columbus, OH | The Chelsea | Subsequent Event |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Number of property acquired | Property |  |  |  |  | 312 |  |  |  |
Purchase Price |  |  |  |  | $ 36,750 |  |  |  |

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