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v3.20.4

Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2020 USD ($) singleFamilyProperty property state | Dec. 31, 2019 USD ($) bulk_disposition singleFamilyProperty | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property Subject to or Available for Operating Lease |  |  |  |
Investments in unconsolidated joint ventures | $ 93,109,000 | $ 67,935,000 |  |
Deferred tax asset and liability, net | 0 |  |  |
Net operating loss carryforward | 60,200,000 | 189,100,000 |  |
Investments in Real Estate |  |  |  |
Purchase price | 269,273,000 | 120,487,000 | $ 489,625,000 |
Single-family Properties Held for Sale and Discontinued Operations |  |  |  |
Loss on impairment of single-family properties and other | 5,421,000 | 3,663,000 | 5,858,000 |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |
Impairment of long-lived assets held-for-use | $ 0 | 0 | 0 |
Leasing Costs |  |  |  |
Lease amortization period | 1 year |  |  |
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 |  |  |
Segment Reporting |  |  |  |
Number of reportable segments | state | 1 |  |  |
Cumulative effect adjustment | $ (6,472,430,000) | $ (6,018,790,000) | (5,973,742,000) | $ (5,875,824,000)
American Homes 4 Rent, L.P. |  |  |  |
Property Subject to or Available for Operating Lease |  |  |  |
Investments in unconsolidated joint ventures | 93,109,000 | 67,935,000 |  |
Investments in Real Estate |  |  |  |
Purchase price | 269,273,000 | 120,487,000 | 489,625,000 |
Single-family Properties Held for Sale and Discontinued Operations |  |  |  |
Loss on impairment of single-family properties and other | 5,421,000 | 3,663,000 | 5,858,000 |
Goodwill |  |  |  |
Goodwill | 120,279,000 | 120,279,000 |  |
Accumulated deficit |  |  |  |
Segment Reporting |  |  |  |
Cumulative effect adjustment | $ 443,522,000 | 465,368,000 | 491,214,000 | $ 453,953,000
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 intangible asset |  |  |  |
Depreciation and Amortization |  |  |  |
Useful life of intangible assets | 7 years |  |  |
Single Family Homes |  |  |  |
Investments in Real Estate |  |  |  |
Number of properties acquired | property | 1,019 |  |  |
Purchase price | $ 266,400,000 |  |  |
Single-family Properties Held for Sale and Discontinued Operations |  |  |  |
Number of properties | singleFamilyProperty | 53,584 |  |  |
Single Family Homes | Single-family Properties Identified for Future Sale |  |  |  |
Single-family Properties Held for Sale and Discontinued Operations |  |  |  |
Number of properties | singleFamilyProperty | 711 | 1,187 |  |
Loss on impairment of single-family properties and other | $ 2,000,000.0 | $ 3,700,000 | $ 5,900,000 |

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