Significant Accounting Policies (Policies)	9 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements are unaudited and present the accounts of both the Company, which include AH4R, the Operating Partnership and their consolidated subsidiaries, as well as the Operating Partnership, which include the Operating Partnership and its consolidated subsidiaries. Intercompany accounts and transactions have been eliminated. The Company consolidates real estate partnerships and other entities that are not variable interest entities (“VIEs”) when it owns, directly or indirectly, a majority interest in the entity or is otherwise able to control the entity. The Company consolidates VIEs in accordance with Accounting Standards Codification No. 810, Consolidation, if the Company is the primary beneficiary of the VIE as determined by the Company’s power to direct the VIE’s activities and its obligation to absorb its losses or the right to receive its benefits, which are potentially significant to the VIE. Entities for which the Company owns an interest, but does not consolidate, are accounted for under the equity method of accounting as an investment in an unconsolidated entity and are included in investments in unconsolidated joint ventures within the condensed consolidated balance sheets. The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and in conjunction with the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures required for annual financial statements have been condensed or excluded pursuant to SEC rules and regulations. Accordingly, the condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. Any references in this report to the number of properties is outside the scope of our independent registered public accounting firm’s review of our financial statements, in accordance with the standards of the Public Company Accounting Oversight Board. In the opinion of management, all adjustments of a normal and recurring nature necessary for a fair statement of the condensed consolidated financial statements for the interim periods have been made. The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Effective March 31, 2021, the Company reclassified certain impairment charges related to homes classified as held for sale from other expenses to gain on sale and impairment of single-family properties and other, net within the condensed consolidated statements of operations. The Company also reclassified other revenues and the remaining other expenses to other income and expense, net within the condensed consolidated statements of operations. Certain other amounts in the condensed consolidated financial statements for the prior periods have also been reclassified to conform to the current year presentation.