Financial Instruments and Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	$ 17,715,054	$ 16,849,076
Fair Value of Debt	17,915,994	18,083,430
Credit Facilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	491,393	171,794
Fair Value of Debt	491,429	171,794
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	14,981,690	14,275,870
Fair Value of Debt	15,151,781	15,452,381
Term Loans and Unsecured Other Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	1,825,195	1,764,311
Fair Value of Debt	1,835,569	1,785,706
Secured Mortgages [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value of Debt	416,776	637,101
Fair Value of Debt	$ 437,215	$ 673,549