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Commitments and Contingencies (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) single_family_property	Dec. 31, 2017 USD ($) single_family_property
Long-term Purchase Commitment [Line Items]
Single-family properties sales in escrow | single_family_property	36	69
Single-family properties sales in escrow, selling price	$ 5.1	$ 7.0
Silver Bay Realty Trust Corp.
Gain (Loss) on Sale of Securities, Net [Abstract]
Gain (loss) on sale of equity investments		$ 3.0
Single Family Properties
Long-term Purchase Commitment [Line Items]
Commitment to acquire single-family properties | single_family_property	219	520
Purchase price of commitment to acquire single-family properties	$ 58.6	$ 128.1
Land
Long-term Purchase Commitment [Line Items]
Purchase price of commitment to acquire single-family properties	$ 42.4	$ 24.0

X

- Definition

Expected Proceeds from Sale of Property Held-for-sale

+ References

No definition available.

+ Details

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Namespace Prefix:	amh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of Real Estate Properties Held-for-Sale in Escrow

+ References

No definition available.

+ Details

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Namespace Prefix:	amh_
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X

- Definition

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- References

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X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of units of goods that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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