Name:	are_CostMethodInvestmentOwnershipPercentage
Namespace Prefix:	are_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the maximum period within which sale of property is expected to be completed.

No definition available.

Name:	are_MaximumExpectedPeriodOfSaleOfProperty
Namespace Prefix:	are_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the maximum period within which receivables are expected to be collected.

No definition available.

Name:	are_MaximumExpectedPeriodforCollectionofReceivables
Namespace Prefix:	are_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of annual taxable income which must be distributed to stockholders in order to comply with requirements of the federal tax law for treatment as a real estate investment trust.

No definition available.

Name:	are_MinimumPercentageOfTaxableIncomeToBeDistributed
Namespace Prefix:	are_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The entity generally distributes this percentage or more of its taxable income.

No definition available.

Name:	are_PercentOfTaxableIncomeGenerallyDistributedAsDividend
Namespace Prefix:	are_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.