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Shareholders' Equity / Partners' Capital - Class A Common Shares (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 05, 2018 | Sep. 30, 2018 USD ($) shares | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Sep. 30, 2017 $ / shares | Mar. 31, 2016 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of Class A common shares | $ |  |  |  |  | $ 0 | $ 694,765 | $ 102,830 |  |
Class A common shares/units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock exchange ratio | 1.4275 |  |  |  |  |  |  |  |
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 |  | $ 0 | $ 10,637 | $ 227 |  |
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 |  |  |  |
General partner ownership interest |  |  |  |  | 84.30% |  |  |  |
Percentage of units outstanding |  |  |  |  |  | 83.80% |  |  |
Units outstanding (in shares) |  |  |  |  | 351,966,447 | 342,099,865 |  |  |
Operating Partnership | Class A Units | American Residential Properties Inc. |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Percentage of units outstanding |  |  |  |  | 0.30% |  |  |  |
Units outstanding (in shares) |  |  |  |  |  | 1,073,509 |  |  |

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