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Fair value measurements - Assets and Liabilities on Recurring Basis (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers In Fair Value Hierarchy | $ 0 |
Net assets classified as held for sale | 371,257,000 | $ 191,433,000
Investments | 1,476,985,000 | 1,449,518,000
Secured notes payable | 149,909,000 | 119,662,000
Unsecured senior notes payable | 12,094,465,000 | 11,096,028,000
Unsecured senior line of credit and commercial paper | 0 | 99,952,000
Book Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Secured notes payable | 149,909,000 | 119,662,000
Unsecured senior notes payable | 12,094,465,000 | 11,096,028,000
Book Value | Commercial paper program |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commercial paper program | 0 | 99,952,000
Book Value | Unsecured senior line of credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unsecured senior line of credit and commercial paper | 0 | 0
Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real Estate, Held-for-Sale | 322,662,000 | 133,885,000
Secured notes payable, fair value | 149,413,000 | 118,660,000
Unsecured senior notes payable, fair value | 10,472,993,000 | 9,708,930,000
Fair Value | Fair value measured on nonrecurring basis | Commercial paper program |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commercial paper program, fair value | 0 | 99,915,000
Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unsecured senior line of credit, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-Lived Asset, Held-for-Sale, Fair Value Disclosure | 0 | 0
Secured notes payable, fair value | 0 | 0
Unsecured senior notes payable, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on nonrecurring basis | Commercial paper program |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commercial paper program, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unsecured senior line of credit, fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-Lived Asset, Held-for-Sale, Fair Value Disclosure | 0 | 0
Secured notes payable, fair value | 149,413,000 | 118,660,000
Unsecured senior notes payable, fair value | 10,472,993,000 | 9,708,930,000
Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on nonrecurring basis | Commercial paper program |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commercial paper program, fair value | 0 | 99,915,000
Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unsecured senior line of credit, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-Lived Asset, Held-for-Sale, Fair Value Disclosure | 322,662,000 | 133,885,000
Secured notes payable, fair value | 0 | 0
Unsecured senior notes payable, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on nonrecurring basis | Commercial paper program |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commercial paper program, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unsecured senior line of credit, fair value | 0 | 0
Investments in publicly traded companies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in publicly traded companies | 105,667,000 | 159,566,000
Investments in publicly traded companies | Fair value measured on recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in publicly traded companies | 105,667,000 | 159,566,000
Investments in publicly traded companies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in publicly traded companies | 105,667,000 | 159,566,000
Investments in publicly traded companies | Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in publicly traded companies | 0 | 0
Investments in publicly traded companies | Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in publicly traded companies | 0 | 0
Investments in privately held entities that report NAV |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in publicly traded companies | 609,866,000 | 671,532,000
Investments in privately held entities that do not report NAV | Entities without observable price changes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in privately held entities that do not report fair value, book value | 400,487,000 | 368,654,000
Investments in privately held entities that do not report NAV | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in privately held entities that do not report fair value, book value | 184,236,000 | 188,689,000
Investments in privately held entities that do not report NAV | Quoted Prices in Active Markets for Identical Assets (Level 1) | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in privately held entities that do not report fair value, book value | 0 | 0
Investments in privately held entities that do not report NAV | Significant Other Observable Inputs (Level 2) | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in privately held entities that do not report fair value, book value | 174,737,000 | 174,268,000
Investments in privately held entities that do not report NAV | Significant Unobservable Inputs (Level 3) | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in privately held entities that do not report fair value, book value | 9,499,000 | 14,421,000
Investments in privately held entities that do not report NAV | Entities without observable price changes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in privately held entities that do not report fair value, book value | $ 400,500,000 | $ 368,700,000

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=are_EntitieswithoutobservablepricechangesMember
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Data Type: | na
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