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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 $ / shares | Oct. 03, 2017 $ / shares | Sep. 30, 2017 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of class A common shares |  |  |  |  | $ 0 | $ 0 | $ 694,765
Class A common shares/units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock exchange ratio | 1.4275 | 1.3106 |  |  |  |  |
Issuance of class A common shares, net of offering costs (in shares) | shares |  |  | 13,800,000 | 14,842,982 |  |  |
Common shares, par value (in dollars per share) | $ / shares | $ 0.01 | $ 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 | $ 0 | $ 10,637
Operating Partnership | Class A Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock exchange ratio |  |  |  |  | 1 |  |
American Homes 4 Rent |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
General partner ownership interest |  |  |  |  | 85.20% | 84.30% |
Operating Partnership | Class A Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Units outstanding (in shares) | shares |  |  |  |  | 352,769,654 | 351,966,447 |

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