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Financial Instruments - Debt Instruments with Carrying Values Different than Estimated Fair Values (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Senior notes, Carrying Amount $ 2,453,336 $ 2,147,097
Revolving Credit Facilities and term loans, Carrying Amount 792,869 897,905
Mortgage indebtedness, Carrying Amount 1,349,852 1,274,141
Total indebtedness 4,596,057 4,319,143
Senior notes, Fair Value 2,702,949 2,503,127
Revolving Credit Facilities and term loans, Fair Value 794,912 903,210
Mortgage indebtedness, Fair Value 1,371,949 1,324,969
Long-term debt, Fair Value Total $ 4,869,810 $ 4,731,306