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Financial Instruments - Debt Instruments With Carrying Value Different Than Estimated Fair Values (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 2,147,097 $ 2,139,718
Revolving Credit Facilities and Term Loans, Carrying amount 897,905 642,421
Mortgage indebtedness 1,274,141 1,322,445
Total indebtedness 4,319,143 4,104,584
Senior notes, Fair Value 2,503,127 2,282,818
Revolving Credit Facilities and Term Loans, Fair Value 903,210 641,854
Mortgage and indebtedness, Fair Value 1,324,969 1,352,142
Long-term debt, Fair Value Total $ 4,731,306 $ 4,276,814