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Commitments and contingencies (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Commitment to renovate homes    
Commitments and contingencies    
Aggregate outstanding commitment $ 4.1amh_OutstandingCommitment
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= amh_CommitmentsForRenovationMember		 $ 4.1amh_OutstandingCommitment
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= amh_CommitmentsForRenovationMember
Commitment to acquire properties    
Commitments and contingencies    
Aggregate purchase price $ 17.3us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= amh_CommitmentToAcquirePropertiesMember		 $ 110.9us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= amh_CommitmentToAcquirePropertiesMember
Number of properties 119amh_CommitmentToAcquirePropertiesNumber
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= amh_CommitmentToAcquirePropertiesMember		 703amh_CommitmentToAcquirePropertiesNumber
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= amh_CommitmentToAcquirePropertiesMember