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Significant accounting policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 property	Dec. 31, 2013 property	Dec. 31, 2012
Property Subject to or Available for Operating Lease
Number of properties	34,599us-gaap_NumberOfRealEstateProperties	23,268us-gaap_NumberOfRealEstateProperties
Income Taxes
Deferred tax assets	$ 0us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax liabilities	0us-gaap_DeferredTaxLiabilitiesCurrent
Unrecognized tax benefits	0us-gaap_UnrecognizedTaxBenefits
Investments in Real Estate
Acquired leases term	less than one year
Impairment of Long-lived Assets
Long-lived assets, impairment charge	$ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	$ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	$ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Leasing Costs
Lease amortization period	1 year
leasing fee paid to property manager	one-half of one month's rent for each lease.
Single-Family Properties Held for Sale
Property Subject to or Available for Operating Lease
Number of properties	26us-gaap_NumberOfRealEstateProperties / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = amh_PropertiesHeldForSaleMember	44us-gaap_NumberOfRealEstateProperties / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = amh_PropertiesHeldForSaleMember
Buildings
Depreciation and Amortization
Estimated useful life of asset	30 years
Improvements | Minimum
Depreciation and Amortization
Estimated useful life of asset	5 years
Improvements | Maximum
Depreciation and Amortization
Estimated useful life of asset	15 years

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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A general description of the nature of the existing leasing arrangements of a lessor for all operating leases including, but not limited to: (1) guarantees or indemnities; (2) restrictions imposed by lease arrangements; (3) unusual provisions or conditions; (4) contingent rentals; and (5) lease expiration dates.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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