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Debt - Narrative (Details) | 3 Months Ended | 12 Months Ended |
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Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) debtInstrumentExtensionOption | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2015 USD ($) singleFamilyProperty | Mar. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) property | Sep. 30, 2014 USD ($) property | Dec. 31, 2021 USD ($) singleFamilyProperty | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan payoff amount |  |  |  |  |  |  |  |  | $ 24,311,000 | $ 22,501,000 | $ 21,517,000 |
Debt outstanding |  |  |  |  |  |  |  |  | 3,924,181,000 | 2,848,492,000 |  |
Proceeds from unsecured senior notes, net of discount |  |  |  |  |  |  |  |  | 737,195,000 | 0 | 397,944,000 |
Deferred financing costs, net |  |  |  |  |  |  |  |  | 28,142,000 | 27,422,000 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  |  |  |  |  |  | $ 1,060,000,000 | 130,000,000 | 250,000,000 |
Single Family Homes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties | singleFamilyProperty |  |  |  |  |  |  |  |  | 57,024 |  |  |
Term loan facility, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  |  |  |  |  |  | $ 0 | 0 | 100,000,000 |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum coverage ratio |  |  |  |  |  |  |  |  | 1.20 |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 1,924,181,000 | 1,948,492,000 |  |
Secured Debt | Asset Backed Securitizations September 2014 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 513,300,000 |  |  |  |
Debt instrument term |  |  |  |  |  |  |  | 10 years |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  |  | 4.42% |  |  |  |
Number of properties | property |  |  |  |  |  |  |  | 4,487 |  |  |  |
Loan payoff amount |  |  |  |  |  |  |  | $ 25,700,000 |  |  |  |
Proceeds from asset-backed securitizations |  |  |  |  |  |  |  | 487,700,000 |  |  |  |
Debt issuance cost |  |  |  |  |  |  |  | $ 12,900,000 |  |  |  |
Secured Debt | Asset Backed Securitizations November 2014 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 528,400,000 |  |  |  |  |
Debt instrument term |  |  |  |  |  |  | 10 years |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  | 4.40% |  |  |  |  |
Number of properties | property |  |  |  |  |  |  | 4,503 |  |  |  |  |
Proceeds from asset-backed securitizations |  |  |  |  |  |  | $ 528,400,000 |  |  |  |  |
Debt issuance cost |  |  |  |  |  |  | $ 12,900,000 |  |  |  |  |
Secured Debt | Asset Backed Securitizations March 2015 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 552,800,000 |  |  |  |  |  |
Debt instrument term |  |  |  |  |  | 30 years |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  | 4.14% |  |  |  |  |  |
Number of properties | property |  |  |  |  |  | 4,661 |  |  |  |  |  |
Proceeds from asset-backed securitizations |  |  |  |  |  | $ 552,800,000 |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  | $ 13,300,000 |  |  |  |  |  |
Secured Debt | Asset Backed Securitizations September 2015 Securitization | Single Family Homes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 477,700,000 |  |  |  |  |  |  |
Debt instrument term |  |  |  |  | 30 years |  |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  | 4.36% |  |  |  |  |  |  |
Number of properties | singleFamilyProperty |  |  |  |  | 4,125 |  |  |  |  |  |  |
Proceeds from asset-backed securitizations |  |  |  |  | $ 477,700,000 |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  | $ 11,300,000 |  |  |  |  |  |  |
Senior notes | Designated as Hedging Instrument | Treasury Lock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  | 4.08% |  |  |  |  |  |  |  |
Senior notes | 2031 unsecured senior notes, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 450,000,000 | 0 |  |
Interest rate | 2.375% |  |  |  |  |  |  |  | 2.38% |  |  |
Redeemable percentage of debt | 100.00% |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  | 2.46% |  |  |
Senior notes | 2051 unsecured senior notes, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 300,000,000 | 0 |  |
Interest rate | 3.375% |  |  |  |  |  |  |  | 3.38% |  |  |
Redeemable percentage of debt | 100.00% |  |  |  |  |  |  |  |  |  |  |
Senior notes | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from unsecured senior notes, net of discount | $ 731,600,000 |  |  |  |  |  |  |  |  |  |  |
Underwriting fees | 5,600,000 |  |  |  |  |  |  |  |  |  |  |
Unamortized discount on debt | 12,800,000 |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs, net | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |
Senior notes | 4.90 Percent Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 400,000,000 | 400,000,000 |  |
Interest rate |  |  | 4.90% |  |  |  |  |  | 4.90% |  |  |
Proceeds from unsecured senior notes, net of discount |  |  | $ 395,300,000 |  |  |  |  |  |  |  |  |
Underwriting fees |  |  | 2,600,000 |  |  |  |  |  |  |  |  |
Unamortized discount on debt |  |  | 2,100,000 |  |  |  |  |  |  |  |  |
Deferred financing costs, net |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Redeemable percentage of debt |  |  | 100.00% |  |  |  |  |  |  |  |  |
Senior notes | 4.25 Percent Senior Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 500,000,000 | 500,000,000 |  |
Interest rate |  |  |  | 4.25% |  |  |  |  | 4.25% |  |  |
Proceeds from unsecured senior notes, net of discount |  |  |  | $ 494,000,000 |  |  |  |  |  |  |  |
Underwriting fees |  |  |  | 3,200,000 |  |  |  |  |  |  |  |
Unamortized discount on debt |  |  |  | 2,800,000 |  |  |  |  |  |  |  |
Deferred financing costs, net |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |
Redeemable percentage of debt |  |  |  | 100.00% |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  | 4.08% |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 350,000,000 | $ 0 |  |
Interest rate |  |  |  |  |  |  |  |  | 1.20% |  |  |
Credit facility maximum borrowing capacity |  | $ 1,250,000,000 |  |  |  |  |  |  | $ 1,250,000,000 |  |  | $ 800,000,000
Number of debt instrument extension options | debtInstrumentExtensionOption |  | 2 |  |  |  |  |  |  |  |  |  |
Line of credit extension period |  | 6 months |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 1.10% |  |  |
Debt instrument, basis spread on base rate |  | 1.00% |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on base rate |  | 0.50% |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee |  |  |  |  |  |  |  |  | 0.125% |  |  |
Line of Credit | Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.725% |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee |  |  |  |  |  |  |  |  | 0.30% |  |  |
Line of Credit | Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.45% |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.45% |  |  |  |  |  |  |  |  |  |
Line of Credit | Term loan facility, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  |  |  |  |  |  |  |  | 100,000,000 |
Write off of deferred debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 700,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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