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Subsequent Events - Subsequent Dispositions (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2016 USD ($) property | Sep. 30, 2016 USD ($) property | Sep. 30, 2016 USD ($) property | Sep. 30, 2015 USD ($)
Subsequent Event [Line Items] |  |  |  |
Number of real estate properties sold | property |  | 453 | 587 |
Proceeds from the sale of real estate properties | $ |  | $ 56,200 | $ 71,894 | $ 0
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of real estate properties sold | property | 36 |  |  |
Proceeds from the sale of real estate properties | $ | $ 5,700 |  |  |

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- Definition Number Of Real Estate Properties Sold + References No definition available. + Details
Name: | amh_NumberOfRealEstatePropertiesSold
Namespace Prefix: | amh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |