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Fair Value Measurements - Debt Instruments with Carrying Values Different than Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 2,912,247 $ 3,149,188
Revolving Credit Facilities and term loans 907,978 807,185
Mortgage indebtedness 1,146,154 1,183,164
Total indebtedness 4,966,379 5,139,537
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 3,134,537 3,292,723
Revolving Credit Facilities and term loans 911,482 811,666
Mortgage indebtedness 1,190,928 1,235,139
Total indebtedness $ 5,236,947 $ 5,339,528