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Deferred Costs and Other Intangibles, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Amortization expense related to deferred leasing costs, in-place leases, trademark and database	$ 2.9	$ 2.1	$ 7.7	$ 7.2
Amortization of deferred financing costs	$ 0.5	$ 0.5	$ 1.5	$ 1.3

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- Definition

Amortization Of Deferred Financing Costs.

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No definition available.

+ Details

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- Definition

The aggregate amount of amortization of intangible assets and deferred leasing fees.

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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