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Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fair Value. |  |
Contingently convertible Series E units liability, Beginning Balance | $ 72,057 amh_ConvertibleSeriesEUnits | $ 66,938 amh_ConvertibleSeriesEUnits
Contingently convertible Series E units liability, Remeasurement included in earnings | 1,838 us-gaap_UnrealizedGainLossOnHybridInstrumentNet | (2,756)us-gaap_UnrealizedGainLossOnHybridInstrumentNet
Contingently convertible Series E units liability, Ending Balance | 70,219 amh_ConvertibleSeriesEUnits | 69,694 amh_ConvertibleSeriesEUnits
Preferred shares derivative liability, Beginning Balance | 57,960 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability | 28,150 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Preferred shares derivative liability, Issuance |  | 1,242 amh_PreferredDerivativeLiabilityIssuance
Preferred shares derivative liability, Remeasurement included in earnings | 120 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet | (457)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Preferred shares derivative liability, Ending Balance | $ 57,840 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability | $ 29,849 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability

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- Definition Fair value of 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
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- Definition Value of issuance of embedded derivative liabilities associated with preferred equity. + References No definition available. + Details
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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=35706170&loc=SL5624163-113959 + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Details
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- Definition Amount of the unrealized gain (loss) in earnings for the period from the increase (decrease) in fair value on hybrid instruments measured at fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35708913&loc=d3e50876-113970 + Details
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