Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent Acquisitions From January 1, 2022 through February 18, 2022, the Company added 411 properties to its portfolio for a total cost of approximately $149.7 million, which included 135 newly constructed properties delivered through our AMH Development Program and 15 newly constructed homes acquired from third-party developers through our National Builder Program. Subsequent Dispositions From January 1, 2022 through February 18, 2022, the Company disposed of 95 properties for aggregate net proceeds of approximately $28.2 million. Revolving Credit Facility From January 1, 2022 through February 18, 2022, the Company borrowed an additional $120.0 million and paid down $360.0 million under its revolving credit facility, resulting in $110.0 million of outstanding borrowings under its revolving credit facility as of February 18, 2022. Distributions On February 17, 2022, the Company’s board of trustees approved an increase in quarterly dividends to $0.18 per Class A and Class B common share for the first quarter of 2022. The quarterly dividends are payable on March 31, 2022 to shareholders of record on March 15, 2022. Class A Common Share Offering In January 2022, the Company completed an underwritten public offering for 23,000,000 of its Class A common shares of beneficial interest, $0.01 par value per share, of which 10,000,000 shares were issued directly by the Company, and 13,000,000 shares were offered on a forward basis at the request of the Company by the forward sellers. In connection with this offering, the Company entered into forward sale agreements with the forward purchasers (the “January 2022 Forward Sale Agreements”) for these 13,000,000 shares which are accounted for in equity. The Company expects to physically settle the January 2022 Forward Sale Agreements by the delivery of the Class A common shares and receive proceeds by January 20, 2023, although the Company has the right to elect settlement prior to that time subject to certain conditions. Although the Company expects to physically settle, the January 2022 Forward Sale Agreements allow the Company to cash or net-share settle all or a portion of its obligations. If the Company elects to cash or net share settle the January 2022 Forward Sale Agreements, the Company may not receive any proceeds, and may owe cash or Class A common shares to the forward purchasers in certain circumstances. The January 2022 Forward Sale Agreements are subject to early termination or settlement under certain circumstances. The Company received net proceeds of $375.8 million from the 10,000,000 Class A common shares issued directly by the Company after deducting underwriting fees and before offering costs of approximately $0.2 million. The Operating Partnership issued an equivalent number of corresponding Class A units to AH4R in exchange for the net proceeds from the issuance. The Company used the net proceeds from the offering to repay indebtedness under its revolving credit facility and for general corporate purposes. The Company did not initially receive proceeds from the sale of the Class A common shares offered on a forward basis but estimates that net proceeds will be approximately $488.6 million after deducting underwriting fees. The Company expects to use these net proceeds (i) to develop new single-family properties and communities, (ii) to acquire and renovate single-family properties and for related activities in accordance with its business strategy and (iii) for general corporate purposes.