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Commitments and contingencies (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 property	Dec. 31, 2013 property	Dec. 31, 2012
Commitments and contingencies
Number of properties	34,599us-gaap_NumberOfRealEstateProperties	23,268us-gaap_NumberOfRealEstateProperties
Company contributions	$ 0.3us-gaap_DefinedBenefitPlanContributionsByEmployer	$ 0.2us-gaap_DefinedBenefitPlanContributionsByEmployer	$ 0.2us-gaap_DefinedBenefitPlanContributionsByEmployer
Commitment to renovate homes
Commitments and contingencies
Aggregate outstanding commitment	4.1amh_OutstandingCommitment / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = amh_CommitmentsForRenovationMember	1.5amh_OutstandingCommitment / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = amh_CommitmentsForRenovationMember
Commitment to acquire properties
Commitments and contingencies
Number of properties	703us-gaap_NumberOfRealEstateProperties / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = amh_CommitmentToAcquirePropertiesMember	536us-gaap_NumberOfRealEstateProperties / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = amh_CommitmentToAcquirePropertiesMember
Aggregate purchase price	$ 110.9amh_AggregatePurchasePrice / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = amh_CommitmentToAcquirePropertiesMember	$ 75.5amh_AggregatePurchasePrice / us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis = amh_CommitmentToAcquirePropertiesMember

X

- Definition

Aggregate Purchase Price

+ References

No definition available.

+ Details

Name:	amh_AggregatePurchasePrice
Namespace Prefix:	amh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of outstanding Commitment.

+ References

No definition available.

+ Details

Name:	amh_OutstandingCommitment
Namespace Prefix:	amh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

- Details

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

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=amh_CommitmentsForRenovationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=amh_CommitmentToAcquirePropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: