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Fair Value Measurements - Debt Instruments with Carrying Values Different than Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 2,910,307 $ 3,149,188
Revolving Credit Facilities and term loans 947,451 807,185
Mortgage indebtedness 1,173,915 1,183,164
Total indebtedness 5,031,673 5,139,537
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 3,077,726 3,292,723
Revolving Credit Facilities and term loans 951,777 811,666
Mortgage indebtedness 1,228,376 1,235,139
Total indebtedness $ 5,257,879 $ 5,339,528