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Commitments and Contingencies (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 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 | 156 | 69
Single-family properties sales in escrow, selling price | $ 24.7 | $ 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] |  |
Purchase price of commitment to acquire single-family properties | 62.2 | 128.1
Land |  |
Long-term Purchase Commitment [Line Items] |  |
Purchase price of commitment to acquire single-family properties | $ 42.5 | $ 24.0
Commitment To Acquire Properties |  |
Long-term Purchase Commitment [Line Items] |  |
Number of properties | single_family_property | 236 | 520

X
- Definition Expected Proceeds from Sale of Property Held-for-sale + References No definition available. + Details
Name: | amh_ExpectedProceedsfromSaleofPropertyHeldforsale
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Number of Real Estate Properties Held-for-Sale in Escrow + References No definition available. + Details
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Namespace Prefix: | amh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 No definition available. + Details
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Balance Type: | credit
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
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |