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Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 bulk_disposition | Dec. 31, 2021 USD ($) singleFamilyProperty property segment | Dec. 31, 2020 USD ($) singleFamilyProperty | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property Subject to or Available for Operating Lease |  |  |  |  |
Investments in unconsolidated joint ventures |  | $ 121,950,000 | $ 93,109,000 |  |
Deferred tax asset and liability, net |  | 0 |  |  |
Net operating loss carryforward |  | 25,400,000 | 68,600,000 |  |
Investments in Real Estate |  |  |  |  |
Purchase price |  | 850,071,000 | 269,273,000 | $ 120,487,000 |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |
Impairment of long-lived assets held-for-use |  | 0 | 0 | 0 |
Depreciation and Amortization |  |  |  |  |
Impairment of intangible assets |  | 0 | 0 | 0 |
Goodwill |  |  |  |  |
Goodwill |  | 120,279,000 | 120,279,000 |  |
Goodwill impairments |  | $ 0 | 0 | 0 |
Impairment charge on joint ventures |  |  | 4,900,000 |  |
Number of bulk disposals | bulk_disposition | 2 |  |  |  |
Revenue and Expense Recognition |  |  |  |  |
Revenue recognition period of operating lease |  | 1 year |  |  |
Leasing Costs |  |  |  |  |
Lease amortization period |  | 1 year |  |  |
Share-Based Compensation |  |  |  |  |
Required retirement notice period |  | 6 months |  |  |
Weighted-average period of unvested cost |  | 6 months |  |  |
Segment Reporting |  |  |  |  |
Number of reportable segments | segment |  | 1 |  |  |
Cumulative effect adjustment |  | $ (6,738,429,000) | (6,472,430,000) | (6,018,790,000) | $ (5,973,742,000)
Gain (Loss) on Investments |  |  |  |  |
Goodwill |  |  |  |  |
Impairment charge on joint ventures |  |  | 3,500,000 |  |
Other Operating Income (Expense) |  |  |  |  |
Goodwill |  |  |  |  |
Impairment charge on joint ventures |  |  | 1,400,000 |  |
Accumulated deficit |  |  |  |  |
Segment Reporting |  |  |  |  |
Cumulative effect adjustment |  | $ 438,710,000 | $ 443,522,000 | 465,368,000 | $ 491,214,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Segment Reporting |  |  |  |  |
Cumulative effect adjustment |  |  |  | 1,494,000 |
Cumulative Effect, Period of Adoption, Adjustment | Accumulated deficit |  |  |  |  |
Segment Reporting |  |  |  |  |
Cumulative effect adjustment |  |  |  | 1,494,000 |
Building and Building Improvements |  |  |  |  |
Depreciation and Amortization |  |  |  |  |
Estimated useful life of asset |  | 30 years |  |  |
Building and Building Improvements | Minimum |  |  |  |  |
Depreciation and Amortization |  |  |  |  |
Estimated useful life of asset |  | 3 years |  |  |
Building and Building Improvements | Maximum |  |  |  |  |
Depreciation and Amortization |  |  |  |  |
Estimated useful life of asset |  | 30 years |  |  |
Database Rights |  |  |  |  |
Depreciation and Amortization |  |  |  |  |
Useful life of intangible assets |  | 7 years |  |  |
Single Family Homes |  |  |  |  |
Investments in Real Estate |  |  |  |  |
Number of properties acquired | property |  | 2,638 |  |  |
Purchase price |  | $ 840,000,000 |  |  |
Single-family Properties Held for Sale and Discontinued Operations |  |  |  |  |
Number of properties | singleFamilyProperty |  | 57,024 |  |  |
Single Family Homes | Minimum |  |  |  |  |
Investments in Real Estate |  |  |  |  |
Purchase price of properties allocated to land, percent |  | 15.00% |  |  |
Single Family Homes | Maximum |  |  |  |  |
Investments in Real Estate |  |  |  |  |
Purchase price of properties allocated to land, percent |  | 30.00% |  |  |
Single Family Homes | Single-family Properties Identified for Future Sale |  |  |  |  |
Single-family Properties Held for Sale and Discontinued Operations |  |  |  |  |
Number of properties | singleFamilyProperty |  | 659 | 711 |  |
Impairment of Real Estate |  | $ 200,000 | $ 2,000,000 | $ 3,700,000 |

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