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Deferred costs and other intangibles (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Deferred costs and other intangibles |  |  |  |
Amortization expense | $ 3.5 | $ 1.9 | $ 7.7 | $ 1.9
Amortization of deferred financing costs | $ 0.9 | $ 0.7 | $ 1.5 | $ 0.9

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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