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Deferred costs and other intangibles (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Deferred costs and other intangibles |  |  |  |
Amortization expense | $ 4.0 | $ 3.2 | $ 11.7 | $ 5.1
Amortization of deferred financing costs | $ 1.4 | $ 2.2 | $ 2.9 | $ 3.1

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- Definition Amortization Of Deferred Financing Costs. + References No definition available. + Details
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Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The aggregate amount of amortization of intangible assets and deferred leasing fees. + References No definition available. + Details
Name: | amh_AmortizationOfIntangibleAssetsAndDeferredLeasingFees
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration