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Deferred Costs and Other Intangibles, Net (Details 2) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Amortization expense | $ 11.0 | $ 9.2 | $ 31.2
Amortization of deferred financing costs | $ 2.0 | $ 1.8 | $ 2.3

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- Definition Amortization Of Deferred Financing Costs. + References No definition available. + Details
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Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The aggregate amount of amortization of intangible assets and deferred leasing fees. + References No definition available. + Details
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Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration