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Deferred costs and other intangibles (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Acquired Indefinite-lived Intangible Assets
Deferred leasing costs	$ 18,307us-gaap_DeferredCostsLeasingGross	$ 12,526us-gaap_DeferredCostsLeasingGross
Deferred financing costs	53,013us-gaap_DeferredFinanceCostsGross	12,147us-gaap_DeferredFinanceCostsGross
Intangible assets:
Intangible assets	86,988amh_DeferredCostsAndIntangibleAssetsGross	35,958amh_DeferredCostsAndIntangibleAssetsGross
Less: accumulated amortization	(32,406)amh_DeferredCostsAndIntangibleAssetsAccumulatedAmortization	(15,385)amh_DeferredCostsAndIntangibleAssetsAccumulatedAmortization
Total	54,582amh_DeferredCostsAndIntangibleAssetsNet	20,573amh_DeferredCostsAndIntangibleAssetsNet
Value of In-place Leases
Intangible assets:
Intangible assets	10,468amh_DeferredCostsAndIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember	6,085amh_DeferredCostsAndIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Trademark
Intangible assets:
Intangible assets	3,100amh_DeferredCostsAndIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	3,100amh_DeferredCostsAndIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Database
Intangible assets:
Intangible assets	$ 2,100amh_DeferredCostsAndIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DatabasesMember	$ 2,100amh_DeferredCostsAndIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DatabasesMember

X

- Definition

Accumulated amount of amortization of deferred costs and finite-lived intangible assets.

+ References

No definition available.

+ Details

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- Definition

Amount before amortization of the sum of deferred costs and finite lived intangible assets.

+ References

No definition available.

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- Definition

Aggregate carrying amount of deferred costs and intangible assets, net of accumulated amortization.

+ References

No definition available.

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- Definition

For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709

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- Definition

For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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