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Shareholders' Equity / Partners' Capital - Class A Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class A Common Shares/Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Offering costs |  |  |  | $ 200 | $ 600 | $ 0
Proceeds from issuance of class A common shares |  |  |  | $ 728,810 | $ 414,100 | $ 0
Class A Common Shares/Units | Public Stock Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 18,745,000 |  |  |  |  |
Stated value per share (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |
Issuance of class A common shares, net of offering costs (in shares) |  | 14,950,000 |  |  |  |
Class A Common Shares/Units | Public Stock Offering - Issued Directly By The Company |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 5,500,000 |  |  |  |  |
Sale of stock, consideration received on transaction | $ 194,000 |  |  |  |  |
Offering costs | $ 200 | $ 200 |  |  |  |
Proceeds from issuance of class A common shares |  | $ 411,700 |  |  |  |
Class A Common Shares/Units | Public Stock Offering - Forward Sales Agreement |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 13,245,000 |  | 13,245,000 |  |  |
Sale of stock, consideration received on transaction |  |  | $ 463,500 |  |  |
American Homes 4 Rent |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
General partner ownership interest |  |  |  | 86.80% | 85.90% |
Class A Units | Operating Partnership |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock exchange ratio |  |  |  | 1 |  |
Units outstanding (in shares) |  |  | 389,374,771 | 389,374,771 | 368,383,440 |

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