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Significant accounting policies - (Details 2) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014 item segment	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2013
Intangible Assets
Impairment of intangible assets	$ 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived	$ 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Goodwill
Goodwill impairments	0us-gaap_GoodwillAndIntangibleAssetImpairment	0us-gaap_GoodwillAndIntangibleAssetImpairment
Significant accounting policies
Total investment	50,400,000amh_InvestmentAmountOnNonperformingLoans
Nonperforming loans	352amh_NumberOfNonperformingLoans
Allowance for Doubtful Accounts
Allowance for doubtful accounts	500,000us-gaap_AllowanceForDoubtfulAccountsReceivable	1,200,000us-gaap_AllowanceForDoubtfulAccountsReceivable
Rescinded Properties
Rescission receivables	1,100,000us-gaap_OtherReceivables	1,300,000us-gaap_OtherReceivables
Revenue and Expense Recognition
Revenue recognition period of operating lease	1 year
Allocated General and Administrative Expense
Allocated general and administrative expenses	21,947,000us-gaap_GeneralAndAdministrativeExpense	8,845,000us-gaap_GeneralAndAdministrativeExpense	7,199,000us-gaap_GeneralAndAdministrativeExpense
Segment Reporting
Number of reportable segments	1us-gaap_NumberOfReportableSegments
Trademark
Intangible Assets
Amortizable Life	4 years 8 months 12 days
Database
Intangible Assets
Amortizable Life	7 years
2,770 Property Contribution
Allocated General and Administrative Expense
Allocated general and administrative expenses				7,989,000us-gaap_GeneralAndAdministrativeExpense / us-gaap_TypeOfArrangementAxis = amh_TwoThousandSevenHundredAndSeventyPropertyContributionMember
2012 Offering | 2,770 Property Contribution
Allocated General and Administrative Expense
Allocated general and administrative expenses		$ 1,000,000us-gaap_GeneralAndAdministrativeExpense / us-gaap_SubsidiarySaleOfStockAxis = amh_TwoThousandAndTwelveOfferingMember / us-gaap_TypeOfArrangementAxis = amh_TwoThousandSevenHundredAndSeventyPropertyContributionMember	$ 6,900,000us-gaap_GeneralAndAdministrativeExpense / us-gaap_SubsidiarySaleOfStockAxis = amh_TwoThousandAndTwelveOfferingMember / us-gaap_TypeOfArrangementAxis = amh_TwoThousandSevenHundredAndSeventyPropertyContributionMember

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Section 02

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