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Real Estate Acquisitions and Dispositions Real Estate Acquisitions and Dispositions - Additional Information (Details) | Dec. 31, 2017 Apartments | Sep. 30, 2017 a Apartments | Jun. 30, 2017 ft² a | Mar. 31, 2017 Apartments
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Paddock Club Lakeland [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of units in real estate property |  | 464 |  |
Area of Land | a |  | 9 |  |
Charlotte at MIdtown [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of units in real estate property |  |  |  | 279
Colonial Grand at Lakewood Ranch [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Square footage of real estate property (square foot) | ft² |  |  | 12 |
Post Alexander [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Area of Land | a |  |  | 1 |
Paddock Club Montgomery [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of units in real estate property |  | 208 |  |
Northwood [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of units in real estate property |  | 270 |  |
Town Park Lot [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Area of Land | a |  | 1 |  |
Acklen West End [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of units in real estate property | 320 |  |  |
Terraces At Fieldstone [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of units in real estate property | 316 |  |  |
Terraces At Townelake [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of units in real estate property | 502 |  |  |

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- Definition Area of land held. + References No definition available. + Details
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