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Shareholders' equity (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
AH LLC |  |  |
Class of Stock |  |  |
Percentage of units outstanding | 21.80%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember |  | 21.80%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember
Operating Partnership | Class A Units |  |  |
Class of Stock |  |  |
Units outstanding (in shares) | 225,927,834 us-gaap_PartnersCapitalAccountUnits / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember |  | 225,914,576 us-gaap_PartnersCapitalAccountUnits / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember
Income (loss) allocated to noncontrolling interest | $ 0.8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember | $ 0.8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember |
Operating Partnership | Class A Units | AH LLC |  |  |
Class of Stock |  |  |
Percentage of units outstanding | 6.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember |  | 6.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember
Units owned (in shares) | 14,440,670 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember |  | 14,440,670 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_ClassAUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember
Operating Partnership | Series C Convertible Units |  |  |
Class of Stock |  |  |
Units owned (in shares) | 31,085,974 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_SeriesCConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember |  | 31,085,974 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_SeriesCConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember
Income (loss) allocated to noncontrolling interest | 4.7 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_CapitalUnitsByClassAxis = amh_SeriesCConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember | 4.5 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_CapitalUnitsByClassAxis = amh_SeriesCConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember |
Operating Partnership | Series C Convertible Units | AH LLC |  |  |
Class of Stock |  |  |
Units owned (in shares) | 31,085,974 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_SeriesCConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember |  | 31,085,974 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_SeriesCConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember
Operating Partnership | Series D Convertible Units | AH LLC |  |  |
Class of Stock |  |  |
Units owned (in shares) | 4,375,000 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_SeriesDConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember |  | 4,375,000 amh_NoncontrollingInterestUnitsOwnedInOperatingPartnership / us-gaap_CapitalUnitsByClassAxis = amh_SeriesDConvertibleUnitsMember / dei_LegalEntityAxis = amh_OperatingPartnershipLegalEntityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_SponsorMember
Certain consolidated subsidiaries with noncontrolling interest |  |  |
Class of Stock |  |  |
Income (loss) allocated to noncontrolling interest |  | 0.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = amh_ConsolidatedSubsidiariesWithNoncontrollingInterestMember |
Certain consolidated subsidiaries with noncontrolling interest | Operating Partnership |  |  |
Class of Stock |  |  |
Income (loss) allocated to noncontrolling interest | $ 0.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = amh_ConsolidatedSubsidiariesWithNoncontrollingInterestMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = amh_OperatingPartnershipRelatedPartyMember |  |

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