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Fair value measurements - Assets and Liabilities on Recurring Basis (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers In Fair Value Hierarchy | $ 0 |
Investments | 1,449,518,000 | $ 1,615,074,000
Secured notes payable | 119,662,000 | 59,045,000
Unsecured senior notes payable | 11,096,028,000 | 10,100,717,000
Unsecured senior line of credit and commercial paper | 99,952,000 | 0
Disposal Group, Including Assets Held for Sale Not Qualifying as Discontinued Operations, Net Assets | 191,433,000 | 116,061,000
Book Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Secured notes payable | 119,662,000 | 59,045,000
Unsecured senior notes payable | 11,096,028,000 | 10,100,717,000
Book Value | Commercial paper program |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commercial paper program | 99,952,000 | 0
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 | 133,885,000 | 116,061,000
Secured notes payable, fair value | 118,660,000 | 58,811,000
Unsecured senior notes payable, fair value | 9,708,930,000 | 8,539,015,000
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 | 99,915,000 | 0
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
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 | 118,660,000 | 58,811,000
Unsecured senior notes payable, fair value | 9,708,930,000 | 8,539,015,000
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 | 99,915,000 | 0
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 | 133,885,000 | 116,061,000
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 | 159,566,000 | 207,139,000
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 | 159,566,000 | 207,139,000
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 | 159,566,000 | 207,139,000
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 | 671,532,000 | 759,752,000
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 | 368,654,000 | 388,940,000
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 | 188,689,000 | 212,262,000
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 | 174,268,000 | 193,784,000
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 | $ 14,421,000 | $ 18,478,000

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- Definition Including the current and noncurrent portions, fair value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References No definition available. + Details
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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: 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)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-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(13)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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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 Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-3 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + 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://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//1943274/2147479440/944-210-S99-1 Reference 3: 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//1943274/2147479853/942-210-S99-1 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + 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://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//1943274/2147479440/944-210-S99-1 Reference 3: 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//1943274/2147479853/942-210-S99-1 + Details
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