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Deferred costs and other intangibles (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred costs and other intangibles
Amortization expense	$ 15.1amh_AmortizationOfIntangibleAssetsAndDeferredLeasingFees	$ 10.7amh_AmortizationOfIntangibleAssetsAndDeferredLeasingFees	$ 0amh_AmortizationOfIntangibleAssetsAndDeferredLeasingFees
Amortization of deferred financing costs	$ 4.6amh_AmortizationOfDeferredFinancingCosts	$ 3.7amh_AmortizationOfDeferredFinancingCosts	$ 0amh_AmortizationOfDeferredFinancingCosts

X

- Definition

Amortization Of Deferred Financing Costs.

+ References

No definition available.

+ Details

Name:	amh_AmortizationOfDeferredFinancingCosts
Namespace Prefix:	amh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- Details

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