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Organization and operations (Details)			0 Months Ended
	Sep. 30, 2014 property state	Dec. 31, 2013 property	Jun. 10, 2013 Operating Partnership Series D Convertible Units	Jun. 10, 2013 Operating Partnership Series E Convertible Units
Organization and operations
Number of properties	30,877	23,268
Number of states	22
Number of properties held for sale	39
Organization and operations
Issuance of units (in shares)			4,375,000	4,375,000

X

- Definition

Represents the number of properties held for sale as on balance sheet date.

+ References

No definition available.

+ Details

Name:	amh_NumberOfPropertiesHeldForSale
Namespace Prefix:	amh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of units issued during the period pursuant to acquisitions.

+ References

No definition available.

+ Details

Name:	amh_PartnersCapitalAccountUnitsIssuedDuringPeriodAcquisitions
Namespace Prefix:	amh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	amh_ScheduleOfDescriptionOfBusinessLineItems
Namespace Prefix:	amh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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