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Shareholders' equity (Details) (USD $)
12 Months Ended 1 Months Ended 2 Months Ended 1 Months Ended 24 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2014
Aug. 31, 2013
Jul. 31, 2014
Mar. 31, 2013
Dec. 31, 2012
Oct. 31, 2013
Dec. 31, 2014
Jan. 31, 2014
Dec. 31, 2013
May 31, 2014
Jan. 31, 2015
Class of Stock                            
Gross proceeds from common stock before offering costs $ 308,435,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 1,548,280,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 494,839,000us-gaap_ProceedsFromIssuanceOfCommonStock                      
Gross proceeds from issuance of Preferred shares before offering costs 189,433,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock 212,596,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock                        
Sale of preferred stock, shares 17,060,000us-gaap_PreferredStockSharesIssued 9,060,000us-gaap_PreferredStockSharesIssued               17,060,000us-gaap_PreferredStockSharesIssued   9,060,000us-gaap_PreferredStockSharesIssued    
Series C Convertible Units                            
Class of Stock                            
Dividend payable per share $ 0.60452us-gaap_DividendsPayableAmountPerShare
/ us-gaap_CapitalUnitsByClassAxis
= amh_SeriesCConvertibleUnitsMember
$ 0.15113us-gaap_DividendsPayableAmountPerShare
/ us-gaap_CapitalUnitsByClassAxis
= amh_SeriesCConvertibleUnitsMember
              $ 0.60452us-gaap_DividendsPayableAmountPerShare
/ us-gaap_CapitalUnitsByClassAxis
= amh_SeriesCConvertibleUnitsMember
  $ 0.15113us-gaap_DividendsPayableAmountPerShare
/ us-gaap_CapitalUnitsByClassAxis
= amh_SeriesCConvertibleUnitsMember
   
Class A common shares                            
Class of Stock                            
Common shares sold       17,782,861us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
                   
Common shares sold in connection with the IPO         55,422,794us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
                 
Common shares, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
          $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Gross proceeds from common stock before offering costs       313,300,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
                   
Offering costs       4,900,000us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
                   
Dividend payable per share $ 0.20us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.05us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
              $ 0.20us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 0.05us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Voting interest (as a percent) 30.00%amh_PercentageOfVotingInterests
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
                30.00%amh_PercentageOfVotingInterests
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
       
Class A common shares | Beazer Rental Homes                            
Class of Stock                            
Common shares sold           8,158,001us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_BusinessAcquisitionAxis
= amh_BeazerPreOwnedRentalHomesIncMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
               
Common shares, par value (in dollars per share)           $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_BusinessAcquisitionAxis
= amh_BeazerPreOwnedRentalHomesIncMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
               
Class A common shares | 2013 Offering                            
Class of Stock                            
Common shares sold             46,718,750us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= amh_TwoThousandAndThirteenOfferingMember
             
Class A common shares | 2012 Offering                            
Class of Stock                            
Common shares sold               35,360,898us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= amh_TwoThousandAndTwelveOfferingMember
           
Class B common shares                            
Class of Stock                            
Common shares, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
              $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
  $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
   
Dividend payable per share $ 0.20us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.05us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
              $ 0.20us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
  $ 0.05us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
   
Common shares entitled to vote 50amh_NumberOfVotesEntitlementForEachShareHeld
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
                         
Voting interest (as a percent) 30.00%amh_PercentageOfVotingInterests
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
                30.00%amh_PercentageOfVotingInterests
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
       
Preferred Units, Issued     653,492us-gaap_PreferredUnitsIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
        653,492us-gaap_PreferredUnitsIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
           
Class B common shares | 2012 Offering | 2,770 Property Contribution | Sponsor                            
Class of Stock                            
Common stock issued in connection with investment (in shares) 635,075us-gaap_SharesIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amh_SponsorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_SubsidiarySaleOfStockAxis
= amh_TwoThousandAndTwelveOfferingMember
/ us-gaap_TypeOfArrangementAxis
= amh_TwoThousandSevenHundredAndSeventyPropertyContributionMember
                635,075us-gaap_SharesIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= amh_SponsorMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_SubsidiarySaleOfStockAxis
= amh_TwoThousandAndTwelveOfferingMember
/ us-gaap_TypeOfArrangementAxis
= amh_TwoThousandSevenHundredAndSeventyPropertyContributionMember
       
Preferred shares                            
Class of Stock                            
Cumulative annual cash dividend rate 5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                         
Liquidation preference per share $ 25us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                $ 25us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
       
Preferred stock, cumulative change in value of index based on purchase prices of single-family properties (as a percent) 50.00%amh_PreferredStockCumulativeChangeInValueOfIndexBasedOnPurchasePrices
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                         
Preferred stock, maximum internal rate of return considering initial liquidation liquidation preference (as a percent) 9.00%amh_MaximumInternalRateOfReturnWhenPreferredStockLiquidationPreferenceConsidered
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                         
Increase in cumulative annual cash dividend rate 10.00%amh_IncreasedPreferredDividendRate
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                         
Liquidation preference (as a percent) 50.00%amh_PreferredStockLiquidationPreferencePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                         
Number of single-family properties located in top markets 20amh_NumberOfSingleFamilyPropertiesLocatedInTopMarkets
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                         
Preferred Stock, Value, Outstanding 441,700,000us-gaap_PreferredStockValueOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
                441,700,000us-gaap_PreferredStockValueOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember
       
Series A Preferred Stock                            
Class of Stock                            
Common shares sold in connection with the IPO                   5,060,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Dividend payable per share $ 1.25us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 0.229167us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
              $ 1.25us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
  $ 0.229167us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Cumulative annual cash dividend rate                   5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
       
Gross proceeds from issuance of Preferred shares before offering costs                 126,500,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Preferred Units, Issued                 5,060,000us-gaap_PreferredUnitsIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Rate of Preferred units                 5.00%amh_DividendRateForPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Offering costs                 7,300,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
         
Series A Preferred Stock | Subsequent Events                            
Class of Stock                            
Rate of Preferred units                           5.00%amh_DividendRateForPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Series B Preferred Stock                            
Class of Stock                            
Common shares sold in connection with the IPO                   4,400,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Dividend payable per share $ 1.2875us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
                $ 1.2875us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Cumulative annual cash dividend rate                   5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
       
Gross proceeds from issuance of Preferred shares before offering costs                     110,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
110,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Preferred Units, Issued   4,400,000us-gaap_PreferredUnitsIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
                4,400,000us-gaap_PreferredUnitsIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
4,400,000us-gaap_PreferredUnitsIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Rate of Preferred units   5.00%amh_DividendRateForPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
                5.00%amh_DividendRateForPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
5.00%amh_DividendRateForPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Offering costs 6,600,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
6,600,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
              6,600,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
6,600,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
6,600,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Series B Preferred Stock | Subsequent Events                            
Class of Stock                            
Rate of Preferred units                           5.00%amh_DividendRateForPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Series C Preferred Stock                            
Class of Stock                            
Common shares sold in connection with the IPO                   7,600,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
       
Dividend payable per share $ 0.912847us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
                $ 0.912847us-gaap_DividendsPayableAmountPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
       
Cumulative annual cash dividend rate                   5.50%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
       
Gross proceeds from issuance of Preferred shares before offering costs                         190,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Preferred Units, Issued                         7,600,000us-gaap_PreferredUnitsIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Rate of Preferred units                         5.50%amh_DividendRateForPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Offering costs $ 9,700,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
                $ 9,700,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
    $ 9,700,000us-gaap_PreferredUnitsOfferingCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember