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

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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