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Financial Instruments and Fair Value Measurements - Debt Instruments with Carrying Values Different than Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 2,810,100 $ 2,913,217
Revolving Credit Facilities and term loans 398,130 598,242
Mortgage indebtedness 641,082 982,509
Total indebtedness 3,849,312 4,493,968
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 2,884,272 3,009,232
Revolving Credit Facilities and term loans 400,119 600,050
Mortgage indebtedness 653,185 1,009,884
Total indebtedness $ 3,937,576 $ 4,619,166