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Financial Instruments - Debt Instruments with Carrying Values Different than Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 3,115,459 $ 2,765,893
Revolving Credit Facilities and Term Loans 741,474 779,009
Mortgage indebtedness 1,403,231 1,689,805
Total indebtedness 5,260,164 5,234,707
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 3,304,869 3,011,374
Revolving Credit Facilities and Term Loans 743,163 786,922
Mortgage indebtedness 1,457,544 1,741,855
Total indebtedness $ 5,505,576 $ 5,540,151