XML 64 R51.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Shareholders' Equity / Partners' Capital - At the Market Common Share Offering Program (Details) - USD ($) $ / shares in Units, shares in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Aug. 31, 2017 | Nov. 30, 2016
Class of Stock [Line Items] |  |  |  |
Proceeds from issuance of shares/units | $ 0 | $ 694,765,000 |  |
Class A common shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issuance costs | 0 | $ 10,444,000 |  |
At the Market - Common Share Offering Program | Class A common shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares available for future issuance, value | $ 500,000,000 |  |  | $ 400,000,000
Shares issued during period (in shares) |  | 2.0 |  |
Proceeds from issuance of shares/units |  | $ 46,200,000 |  |
Shares issued, price per share (in dollars per share) |  | $ 22.74 |  |
Proceeds from issuance of common stock, net of issuance costs |  | $ 45,600,000 |  |
Stock issuance costs |  | $ 600,000 |  |
Shares authorized for future issuance, value |  |  | $ 500,000,000 |

X
- Definition Common Stock, Capital Shares Amount Authorized For Future Issuance + References No definition available. + Details
Name: | amh_CommonStockCapitalSharesAmountAuthorizedForFutureIssuance
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Common Stock, Capital Shares Amount Available For Future Issuance + References No definition available. + Details
Name: | amh_CommonStockCapitalSharesAmountAvailableForFutureIssuance
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Proceeds from sale of stock, net of issuance costs + References No definition available. + Details
Name: | amh_ProceedsFromIssuanceOfCommonStockNet
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=amh_AttheMarketCommonShareOfferingProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |