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Debt (Details) (Senior Secured Revolving Credit Facility, USD $)	3 Months Ended
	Mar. 31, 2014	Sep. 30, 2013	Mar. 07, 2013
Proforma Debt Instrument
Credit facility amount, maximum		$ 800,000,000	$ 500,000,000
Percentage of properties used to calculate borrowing base	50.00%
Borrowings outstanding	671,000,000
Debt covenant, minimum liquidity requirement	15,000,000
Debt covenant, minimum liquidity requirement for cash and cash equivalents	$ 7,500,000
Maximum leverage ratio	1.0
Debt covenant, minimum required tangible net worth (as a percent)	85.00%
Debt covenant, percentage of additional equity capital raised on or after September 30, 2013 that is used in calculation of tangible net worth	85.00%
LIBOR
Proforma Debt Instrument
Debt instrument, description of variable rate	30 day LIBOR
Debt instrument, basis spread on variable rate (as a percent)	2.75%
Until March 2017 | LIBOR
Proforma Debt Instrument
Debt instrument, description of variable rate	30 day LIBOR
Debt instrument, basis spread on variable rate (as a percent)	2.75%
March 2017 and Thereafter | LIBOR
Proforma Debt Instrument
Debt instrument, description of variable rate	30 day LIBOR
Debt instrument, basis spread on variable rate (as a percent)	3.125%

X

- Definition

Represents the minimum required amount of liquidity in the form of cash and cash equivalents, as defined, pursuant to the financial covenants contained in the debt agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the minimum required amount of liquidity, as defined, pursuant to the financial covenants contained in the debt agreement.

+ References

No definition available.

+ Details

Name:	amh_DebtInstrumentCovenantLiquidityRequiredAmount
Namespace Prefix:	amh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the minimum required percentage of tangible net worth, as defined, pursuant to the financial covenants contained in the debt agreement.

+ References

No definition available.

+ Details

Name:	amh_DebtInstrumentCovenantMinimumTangibleNetWorth
Namespace Prefix:	amh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of capital raised subsequent to a specified date which is used to compute the required tangible net worth pursuant to the covenants contained in the debt agreement.

+ References

No definition available.

+ Details

Name:	amh_DebtInstrumentCovenantPercentageOfAdditionalCapitalAppliedToTangibleNetWorthCalculation
Namespace Prefix:	amh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the maximum permitted leverage ratio, as defined, pursuant to the financial covenants contained in the debt agreement.

+ References

No definition available.

+ Details

Name:	amh_DebtInstrumentLeverageRatio
Namespace Prefix:	amh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of the lower of cost or fair value of the reporting entity's leased and un-leased properties which is used to compute the borrowing base under the line of credit.

+ References

No definition available.

+ Details

Name:	amh_LineOfCreditPercentageUsedToCalculateBorrowingBase
Namespace Prefix:	amh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	amh_ProformaDebtInstrumentLineItems
Namespace Prefix:	amh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant