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Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Fair Value
Contingently convertible Series E units liability, Beginning Balance	$ 66,938
Contingently convertible Series E units liability, Remeasurement included in earnings	(2,756)
Contingently convertible Series E units liability, Ending Balance	69,694
Preferred shares derivative liability, Beginning Balance	28,150
Preferred shares derivative liability, Issuance	1,242
Preferred shares derivative liability, Remeasurement included in earnings	(457)
Preferred shares derivative liability, Ending Balance	$ 29,849

X

- 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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Period Type:	instant

X

- Definition

Value of issuance of embedded derivative liabilities associated with preferred equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	amh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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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Period Type:	instant

X

- 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=7476318&loc=SL5624171-113959

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- Details

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X

- 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=6437254&loc=d3e50876-113970

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