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Shareholders' equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Class of Stock |  |
Preferred stock, cumulative change in value of index based on purchase prices of single-family properties (as a percent) | 50.00%amh_PreferredStockCumulativeChangeInValueOfIndexBasedOnPurchasePrices |
Quarterly distributions to preferred shareholders | $ 5,569 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock | $ 3,121 us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Class A common shares |  |
Class of Stock |  |
Dividend payable per share | $ 0.05 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.05 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Series A Preferred Stock |  |
Class of Stock |  |
Dividend payable per share | $ 0.3125 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 0.3125 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock |  |
Class of Stock |  |
Dividend payable per share | $ 0.3125 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 0.3500 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series C Preferred Stock |  |
Class of Stock |  |
Dividend payable per share | $ 0.34375 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 0.15113 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Class B common shares |  |
Class of Stock |  |
Dividend payable per share | $ 0.05 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.05 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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- Definition Preferred Stock, Cumulative Change In Value Of Index Based On Purchase Prices. + References No definition available. + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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