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Debt - Long-term Debt (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
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% |  |  |  |  |  |  |

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