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Financial Instruments - Debt Instruments with Carrying Values Different than Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 3,149,188 $ 2,752,394
Revolving Credit Facilities and term loans 807,185 775,343
Mortgage indebtedness 1,183,164 1,684,487
Total indebtedness 5,139,537 5,212,224
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 3,292,723 3,011,374
Revolving Credit Facilities and term loans 811,666 786,922
Mortgage indebtedness 1,235,139 1,741,855
Total indebtedness $ 5,339,528 $ 5,540,151