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Shareholders' Equity / Partners' Capital - Class A Common Shares (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2016 $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of Class A common shares | $ |  |  |  | $ 694,765 | $ 102,830 | $ 0
Class A common shares/units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of class A common shares, net of offering costs (in shares) | 13,800,000 | 14,842,982 | 36,546,170 |  |  |
Common shares, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |
Proceeds from issuance of Class A common shares | $ | $ 312,000 | $ 336,500 |  |  |  |
Stock issuance costs | $ | $ 9,200 | $ 400 |  | $ 10,637 | $ 227 | $ 0
Class A Units | American Residential Properties Inc. |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Units outstanding (in shares) |  |  | 1,343,843 |  |  |
Operating Partnership | Class A Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock exchange ratio |  |  |  | 1 |  |
Percentage of units outstanding |  |  |  | 83.80% | 81.40% |
Units outstanding (in shares) |  |  |  | 342,099,865 | 298,931,517 |
Operating Partnership | Class A Units | American Residential Properties Inc. |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percentage of units outstanding |  |  |  | 0.30% | 0.40% |
Units outstanding (in shares) |  |  |  | 1,073,509 | 1,279,316 |

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