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Significant Accounting Policies - Narrative (Details)
 12 Months Ended
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