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Debt - Long-term Debt (Details) - USD ($)	12 Months Ended
Debt - Long-term Debt (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Total debt	$ 3,924,181,000	$ 2,848,492,000
Unamortized discounts on unsecured senior notes	(15,561,000)	(3,658,000)
Deferred financing costs, net	(28,142,000)	(27,422,000)
Total debt per balance sheet	3,880,478,000	2,817,412,000
Amortization of debt issuance costs	8,790,000	7,431,000	$ 7,457,000
Asset-Backed Securitizations, Unsecured Senior Notes and Term Loan Facility
Debt Instrument [Line Items]
Amortization of debt issuance costs	6,100,000	5,900,000	$ 5,900,000
Secured Debt
Debt Instrument [Line Items]
Total debt	$ 1,924,181,000	1,948,492,000
Secured Debt \| AH4R 2014-SFR2 securitization
Debt Instrument [Line Items]
Interest rate	4.42%
Total debt	$ 473,594,000	479,981,000
Secured Debt \| AH4R 2014-SFR3 securitization
Debt Instrument [Line Items]
Interest rate	4.40%
Total debt	$ 488,790,000	495,392,000
Secured Debt \| 2015-SFR 1
Debt Instrument [Line Items]
Interest rate	4.14%
Total debt	$ 514,868,000	520,957,000
Secured Debt \| AH4R 2015-SFR2 securitization
Debt Instrument [Line Items]
Interest rate	4.36%
Total debt	$ 446,929,000	452,162,000
Exchangeable Senior Notes \| 4.25 Percent Senior Notes Due 2028
Debt Instrument [Line Items]
Interest rate	4.25%							4.25%
Effective interest rate	4.08%
Total debt	$ 500,000,000	500,000,000
Deferred financing costs, net								$ (1,900,000)
Exchangeable Senior Notes \| 4.90 Percent Senior Notes Due 2029
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)
Exchangeable Senior Notes \| 2031 unsecured senior notes, net
Debt Instrument [Line Items]
Interest rate	2.38%			2.375%
Effective interest rate	2.46%
Total debt	$ 450,000,000	0
Exchangeable Senior Notes \| 2051 unsecured senior notes, net
Debt Instrument [Line Items]
Interest rate	3.38%			3.375%
Total debt	$ 300,000,000	0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate	1.20%
Total debt	$ 350,000,000	0
Credit facility maximum borrowing capacity	1,250,000,000				$ 1,250,000,000	$ 800,000,000
Letters of credit outstanding	$ 1,600,000	$ 1,500,000
Line of Credit \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%