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Single-family properties (Details 2) (Single family homes, USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Single family homes
      
Property Subject to or Available for Operating Lease      
Net book value $ 114,600,000amh_RealEstateInvestmentPropertyUnrecordedDeed
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 $ 120,600,000amh_RealEstateInvestmentPropertyUnrecordedDeed
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		  
Depreciation expense $ 150,500,000us-gaap_Depreciation
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 $ 60,300,000us-gaap_Depreciation
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember		 $ 2,100,000us-gaap_Depreciation
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= amh_SingleFamilyHomesMember