Financial Instruments and Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	$ 35,302,901	$ 30,879,263
Fair Value of Debt	33,421,863	28,611,253
Credit Facilities and Commercial Paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	224,922	224,966
Fair Value of Debt	224,922	224,966
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	32,777,234	28,322,163
Fair Value of Debt	30,942,032	26,095,901
Term Loans and Unsecured Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	1,979,040	2,013,317
Fair Value of Debt	1,943,300	1,991,934
Secured Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	321,705	318,817
Fair Value of Debt	$ 311,609	$ 298,452