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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

X

- 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