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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