Debt - Schedule of Debt (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) extensionOption	Jun. 30, 2023 debtInstrumentExtensionOption	Dec. 31, 2024 USD ($) debtInstrumentExtensionOption	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Total debt			$ 5,075,391,000	$ 4,517,158,000
Unamortized discounts on unsecured senior notes			(35,594,000)	(32,981,000)
Deferred financing costs, net			(29,035,000)	(22,530,000)
Total debt per balance sheet			5,010,762,000	4,461,647,000
Extension period	6 months
Amortization of debt issuance costs			11,489,000	12,279,000	$ 11,673,000
Asset-Backed Securitizations and Unsecured Senior Notes
Debt Instrument [Line Items]
Amortization of debt issuance costs			6,200,000	7,000,000.0	$ 6,800,000
Secured Debt
Debt Instrument [Line Items]
Total debt			$ 925,391,000	1,877,158,000
Secured Debt | AMH 2014-SFR2 securitization, net
Debt Instrument [Line Items]
Interest rate			4.42%
Total debt			$ 0	461,498,000
Secured Debt | AMH 2014-SFR3 securitization, net
Debt Instrument [Line Items]
Interest rate			4.40%
Total debt			$ 0	477,064,000
Secured Debt | AH4R 2015-SFR1 securitization
Debt Instrument [Line Items]
Interest rate			4.14%
Total debt			$ 494,868,000	502,299,000
Potential weighted-average interest rate increase contingent upon repayment			3.00%
Secured Debt | AMH 2015-SFR2 securitization, net
Debt Instrument [Line Items]
Interest rate			4.36%
Total debt			$ 430,523,000	436,297,000
Potential weighted-average interest rate increase contingent upon repayment			3.00%
Senior Notes | 2028 unsecured senior notes
Debt Instrument [Line Items]
Interest rate			4.25%									4.25%
Effective interest rate			4.08%									4.08%
Total debt			$ 500,000,000	500,000,000
Deferred financing costs, net												$ (1,900,000)
Senior Notes | 2029 unsecured senior notes
Debt Instrument [Line Items]
Interest rate			4.90%								4.90%
Total debt			$ 400,000,000	400,000,000
Deferred financing costs, net											$ (1,000,000.0)
Senior Notes | 2031 unsecured senior notes
Debt Instrument [Line Items]
Interest rate			2.38%						2.375%
Effective interest rate			2.46%						2.46%
Total debt			$ 450,000,000	450,000,000
Senior Notes | 2032 unsecured senior notes
Debt Instrument [Line Items]
Interest rate			3.63%					3.625%
Total debt			$ 600,000,000	600,000,000
Senior Notes | 2034 unsecured senior notes I
Debt Instrument [Line Items]
Interest rate			5.50%				5.50%
Total debt			$ 600,000,000	0
Deferred financing costs, net							$ (1,300,000)
Senior Notes | 2034 unsecured senior notes II
Debt Instrument [Line Items]
Interest rate			5.50%			5.50%
Total debt			$ 500,000,000	0
Deferred financing costs, net						$ (1,100,000)
Senior Notes | 2035 unsecured senior notes, net
Debt Instrument [Line Items]
Interest rate			5.25%
Effective interest rate			5.08%
Total debt			$ 500,000,000	0
Deferred financing costs, net			$ (1,100,000)
Senior Notes | 2051 unsecured senior notes
Debt Instrument [Line Items]
Interest rate			3.38%						3.375%
Total debt			$ 300,000,000	300,000,000
Senior Notes | 2052 unsecured senior notes
Debt Instrument [Line Items]
Interest rate			4.30%					4.30%
Total debt			$ 300,000,000	300,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate			5.44%
Total debt			$ 0	90,000,000
Credit facility maximum borrowing capacity	$ 1,250,000,000		$ 1,250,000,000							$ 1,250,000,000
Number of extension options	2	2	2
Extension period		6 months	6 months
Letters of credit outstanding			$ 2,000,000.0	$ 2,700,000
Line of Credit | Revolving Credit Facility | Variable Rate Component One
Debt Instrument [Line Items]
Basis spread on variable rate			0.10%
Line of Credit | Revolving Credit Facility | Variable Rate Component Two
Debt Instrument [Line Items]
Basis spread on variable rate			0.85%