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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
Name: | amh_DebtInstrumentCovenantLiquidityCashAndCashEquivalentRequiredAmount
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
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant