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Single-family properties (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
property
Dec. 31, 2014
property
Property Subject to or Available for Operating Lease    
Number of properties 36,588us-gaap_NumberOfRealEstateProperties 34,599us-gaap_NumberOfRealEstateProperties
Net book value $ 6,037,355us-gaap_RealEstateInvestmentPropertyNet $ 5,710,671us-gaap_RealEstateInvestmentPropertyNet
Single family homes | Properties being renovated    
Property Subject to or Available for Operating Lease    
Number of properties 1,863us-gaap_NumberOfRealEstateProperties
/ us-gaap_MajorPropertyClassAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 2,886us-gaap_NumberOfRealEstateProperties
/ us-gaap_MajorPropertyClassAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
Net book value 293,221us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 476,120us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
Single family homes | Properties being prepared for re-lease    
Property Subject to or Available for Operating Lease    
Number of properties 838us-gaap_NumberOfRealEstateProperties
/ us-gaap_MajorPropertyClassAxis
= amh_PropertiesBeingPreparedForReLeaseMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 630us-gaap_NumberOfRealEstateProperties
/ us-gaap_MajorPropertyClassAxis
= amh_PropertiesBeingPreparedForReLeaseMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
Net book value 136,905us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MajorPropertyClassAxis
= amh_PropertiesBeingPreparedForReLeaseMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 104,974us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MajorPropertyClassAxis
= amh_PropertiesBeingPreparedForReLeaseMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
Single family homes | Properties held for sale    
Property Subject to or Available for Operating Lease    
Number of properties 35us-gaap_NumberOfRealEstateProperties
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldForSaleMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 26us-gaap_NumberOfRealEstateProperties
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldForSaleMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
Net book value 5,428us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldForSaleMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 3,818us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldForSaleMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
Leased | Single family homes    
Property Subject to or Available for Operating Lease    
Number of properties 31,183us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember		 28,250us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
Net book value 5,112,511us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember		 4,631,797us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
Vacant | Single family homes    
Property Subject to or Available for Operating Lease    
Number of properties 2,669us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertyAvailableForOperatingLeaseMember		 2,807us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertyAvailableForOperatingLeaseMember
Net book value $ 489,290us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertyAvailableForOperatingLeaseMember		 $ 493,962us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertyAvailableForOperatingLeaseMember