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Shareholders' Equity / Partners' Capital - Noncontrolling Interest (Details) - Class A Units - Operating Partnership - shares | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Class of Stock [Line Items] |  |
Operating partnership units (in shares) | 351,881,447 | 342,099,865
American Residential Properties Inc. |  |
Class of Stock [Line Items] |  |
Percentage of units outstanding | 0.30% | 0.30%
Operating partnership units (in shares) | 1,073,509 | 1,073,509
AH LLC |  |
Class of Stock [Line Items] |  |
Ownership units owned (in shares) | 54,276,644 | 54,276,644
Percentage of units outstanding | 15.40% | 15.90%

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