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Single-family properties (Details) (USD $)	Dec. 31, 2014 property	Dec. 31, 2013 property
Property Subject to or Available for Operating Lease
Number of properties	34,599us-gaap_NumberOfRealEstateProperties	23,268us-gaap_NumberOfRealEstateProperties
Net book value	$ 5,710,671,000us-gaap_RealEstateInvestmentPropertyNet	$ 3,861,422,000us-gaap_RealEstateInvestmentPropertyNet
Single family homes
Property Subject to or Available for Operating Lease
Number of properties	34,599us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	23,268us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember
Net book value	5,710,671,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	3,861,422,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember
Single family homes | Properties being renovated
Property Subject to or Available for Operating Lease
Number of properties	2,886us-gaap_NumberOfRealEstateProperties / us-gaap_MajorPropertyClassAxis = us-gaap_ConstructionInProgressMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	2,463us-gaap_NumberOfRealEstateProperties / us-gaap_MajorPropertyClassAxis = us-gaap_ConstructionInProgressMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember
Net book value	476,120,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MajorPropertyClassAxis = us-gaap_ConstructionInProgressMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	348,571,000us-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	630us-gaap_NumberOfRealEstateProperties / us-gaap_MajorPropertyClassAxis = amh_PropertiesBeingPreparedForReLeaseMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	281us-gaap_NumberOfRealEstateProperties / us-gaap_MajorPropertyClassAxis = amh_PropertiesBeingPreparedForReLeaseMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember
Net book value	104,974,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MajorPropertyClassAxis = amh_PropertiesBeingPreparedForReLeaseMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	45,404,000us-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	26us-gaap_NumberOfRealEstateProperties / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	44us-gaap_NumberOfRealEstateProperties / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember
Net book value	3,818,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember	6,569,000us-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	28,250us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember	17,328us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember
Net book value	4,631,797,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember	2,914,947,000us-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	2,807us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember	3,152us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember
Net book value	$ 493,962,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember	$ 545,931,000us-gaap_RealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = amh_SingleFamilyHomesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertyAvailableForOperatingLeaseMember

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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X

- 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

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