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Fair Value - Changes in Fair Value of Contingently Convertible Series E Units Liability and Preferred Shares Derivative Liability (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Preferred shares derivative liability, Beginning Balance |
Preferred shares derivative liability, Issuance | 26,340
Preferred shares derivative liability, Remeasurement included in earnings | 1,810
Preferred shares derivative liability, Ending Balance | 28,150
Contingently convertible Series E units liability, Beginning Balance |
Contingently convertible Series E units liability, Issuances | 64,881
Contingently convertible Series E units liability, Remeasurement included in earnings | 2,057
Contingently convertible Series E units liability, Ending Balance | $ 66,938

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- Definition Series E convertible units that represent non-voting interests in the Operating Partnership that may be settled into a variable number of Series D units or Class A units on a specified date. + References No definition available. + Details
Name: | amh_ConvertibleSerieseUnits
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Convertible SeriesE Units Liability, Issuance + References No definition available. + Details
Name: | amh_ConvertibleSerieseUnitsLiabilityIssuance
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Value of issuance of embedded derivative liabilities associated with preferred equity. + References No definition available. + Details
Name: | amh_PreferredDerivativeLiabilityIssuance
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of expense (income) related to adjustment to fair value of preferred derivative liability. + References No definition available. + Details
Name: | amh_PreferredDerivativeLiabilityRemeasurement
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gain/loss associated with the fair value remeasurement of Series E units. + References No definition available. + Details
Name: | amh_ReMeasurementOfSeriese
Namespace Prefix: | amh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration