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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	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)
Class of Stock [Line Items]
Proceeds from issuance of class A common shares			$ 414,100	$ 0	$ 0
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) | shares		14,950,000
Stated value per share (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Proceeds from issuance of class A common shares		$ 411,700
Offering costs		$ 200	$ 600	$ 0	$ 0
Class A Common Shares/units | At the Market - Common Share Offering Program
Class of Stock [Line Items]
Issuance of class A common shares, net of offering costs (in shares) | shares			86,130,000,000
Proceeds from issuance of class A common shares			$ 2,400
Offering costs			$ 400
American Homes 4 Rent
Class of Stock [Line Items]
General partner ownership interest			85.90%	85.20%
Class A Units | Operating Partnership
Class of Stock [Line Items]
Units outstanding (in shares) | shares		368,383,440	368,383,440	352,769,654
Operating Partnership | Class A Units
Class of Stock [Line Items]
Stock exchange ratio			1

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