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Deferred costs and other intangibles (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Intangible Assets  
Remaining 2015 $ 3,492amh_DeferredLeasingFeesAmortizationExpenseRemainderOfFiscalYear
2016 284amh_DeferredLeasingFeesAmortizationExpenseYearTwo
2017 66amh_DeferredLeasingFeesAmortizationExpenseYearThree
Total 3,842us-gaap_DeferredCostsLeasingNet
Remaining 2015 6,921amh_DeferredFinancingCostsAmortizationExpenseRemainderOfFiscalYear
2016 9,258amh_DeferredFinancingCostsAmortizationExpenseYearTwo
2017 7,864amh_DeferredFinancingCostsAmortizationExpenseYearThree
2018 7,387amh_DeferredFinancingCostsAmortizationExpenseYearFour
2019 5,234amh_DeferredFinancingCostsAmortizationExpenseYearFive
Thereafter 19,477amh_DeferredFinancingCostsAmortizationExpenseAfterYearFive
Total 56,141us-gaap_DeferredFinanceCostsNet
Value of In-place Leases  
Intangible Assets  
Remaining 2015 1,814us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
2016 7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Total 1,821us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Trademark  
Intangible Assets  
Remaining 2015 495us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
2016 660us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
2017 660us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
2018 91us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Total 1,906us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Database  
Intangible Assets  
Remaining 2015 225us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember
2016 300us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember
2017 300us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember
2018 300us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember
2019 300us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember
Thereafter 132us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember
Total $ 1,557us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DatabasesMember