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Fair Value - Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loss on settlement of cash flow hedging instrument |  |  | $ 3,999 | $ 0 | $ 0
Designated as Hedging Instrument | Treasury Lock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, notional amount |  | $ 400,000 |  |  |
Derivative, Term of Contract |  | 10 years |  |  |
Loss on settlement of cash flow hedging instrument | $ 4,000 |  |  |  |
Reclassified during next 12 months, net |  |  | 400 |  |
Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Revolving credit facility |  |  | 350,000 | 0 |
Total debt |  |  | 3,880,478 | 2,817,412 |
Carrying Value | AH4R 2014-SFR2 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 470,039 | 475,144 |
Carrying Value | AH4R 2014-SFR3 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 485,005 | 490,319 |
Carrying Value | AH4R 2015-SFR1 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 510,585 | 515,326 |
Carrying Value | AH4R 2015-SFR2 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 442,717 | 446,818 |
Carrying Value | Total asset-backed securitizations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 1,908,346 | 1,927,607 |
Carrying Value | 2028 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 495,166 | 494,378 |
Carrying Value | 2029 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 395,990 | 395,427 |
Carrying Value | 2031 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 440,095 | 0 |
Carrying Value | 2051 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 290,881 | 0 |
Carrying Value | Total unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 1,622,132 | 889,805 |
Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Revolving credit facility |  |  | 350,000 | 0 |
Total debt |  |  | 4,068,175 | 3,040,579 |
Fair Value | AH4R 2014-SFR2 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 479,464 | 488,140 |
Fair Value | AH4R 2014-SFR3 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 495,659 | 504,364 |
Fair Value | AH4R 2015-SFR1 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 521,639 | 529,542 |
Fair Value | AH4R 2015-SFR2 securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 455,264 | 461,037 |
Fair Value | Total asset-backed securitizations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  |  | 1,952,026 | 1,983,083 |
Fair Value | 2028 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 554,895 | 575,220 |
Fair Value | 2029 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 463,840 | 482,276 |
Fair Value | 2031 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 442,953 | 0 |
Fair Value | 2051 unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | 304,461 | 0 |
Fair Value | Total unsecured senior notes, net |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  |  | $ 1,766,149 | $ 1,057,496 |

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