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Debt - Schedule of Debt (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, gross | $ 3,580,431,000 |  | $ 3,580,431,000 |  |  |  |  | $ 2,848,492,000
Unamortized discounts on unsecured senior notes | (15,900,000) |  | (15,900,000) |  |  |  |  | (3,658,000)
Deferred financing costs, net | (29,867,000) |  | (29,867,000) |  |  |  |  | (27,422,000)
Total debt per balance sheet | 3,534,664,000 |  | 3,534,664,000 |  |  |  |  | 2,817,412,000
Amortization of financing costs |  |  | 6,290,000 | $ 5,564,000 |  |  |  |
Asset-backed Securitizations, Unsecured Senior Notes and Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of financing costs | 1,500,000 | $ 1,500,000 | 4,500,000 | $ 4,500,000 |  |  |  |
Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, gross | $ 1,930,431,000 |  | $ 1,930,431,000 |  |  |  |  | 1,948,492,000
Secured Debt | 2014-SFR 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 4.42% |  | 4.42% |  |  |  |  |
Debt, gross | $ 475,336,000 |  | $ 475,336,000 |  |  |  |  | 479,981,000
Secured Debt | 2014-SFR 3 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 4.40% |  | 4.40% |  |  |  |  |
Debt, gross | $ 490,585,000 |  | $ 490,585,000 |  |  |  |  | 495,392,000
Secured Debt | 2015-SFR 1 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 4.14% |  | 4.14% |  |  |  |  |
Debt, gross | $ 516,249,000 |  | $ 516,249,000 |  |  |  |  | 520,957,000
Secured Debt | 2015-SFR 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 4.36% |  | 4.36% |  |  |  |  |
Debt, gross | $ 448,261,000 |  | $ 448,261,000 |  |  |  |  | 452,162,000
Senior Notes | 2028 unsecured senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 4.25% |  | 4.25% |  |  |  |  |
Effective interest rate | 4.08% |  | 4.08% |  |  |  |  |
Debt, gross | $ 500,000,000 |  | $ 500,000,000 |  |  |  |  | 500,000,000
Senior Notes | 2029 unsecured senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 4.90% |  | 4.90% |  |  |  |  |
Debt, gross | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  | 400,000,000
Senior Notes | 2031 unsecured senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 2.38% |  | 2.38% |  | 2.375% |  |  |
Effective interest rate | 2.46% |  | 2.46% |  |  |  |  |
Debt, gross | $ 450,000,000 |  | $ 450,000,000 |  |  |  |  | 0
Senior Notes | 2051 unsecured senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 3.38% |  | 3.38% |  | 3.375% |  |  |
Debt, gross | $ 300,000,000 |  | $ 300,000,000 |  |  |  |  | 0
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | 1.18% |  | 1.18% |  |  |  |  |
Debt, gross | $ 0 |  | $ 0 |  |  |  |  | 0
Maximum borrowing capacity | 1,250,000,000 |  | 1,250,000,000 |  |  | $ 1,250,000,000 | $ 800,000,000 |
Outstanding letters of credit | $ 1,200,000 |  | $ 1,200,000 |  |  |  |  | $ 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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