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Fair Value (Details) (USD $) In Thousands, unless otherwise specified					3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Recurring Significant Unobservable Inputs (Level 3)	Dec. 31, 2013 Recurring Significant Unobservable Inputs (Level 3)	Mar. 31, 2014 Senior Secured Revolving Credit Facility LIBOR
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis
Debt instrument, description of variable rate					30 day LIBOR
Debt instrument, basis spread on variable rate (as a percent)					2.75%
Contingently convertible Series E units liability	$ 69,694	$ 66,938	$ 69,694	$ 66,938
Preferred shares derivative liability	$ 29,849	$ 28,150	$ 29,849	$ 28,150

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

X

- Details

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X

- Definition

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

+ References

No definition available.

+ Details

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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

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