XML 64 R53.htm IDEA: XBRL DOCUMENT v3.8.0.1
Financial Instruments and Fair Value Measurements - Debt Instruments with Carrying Values Different than Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 2,809,404 $ 2,913,217
Revolving Credit Facilities and term loans 457,858 598,242
Mortgage indebtedness 750,269 982,509
Total indebtedness 4,017,531 4,493,968
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 2,896,258 3,056,896
Revolving Credit Facilities and term loans 460,782 601,131
Mortgage indebtedness 771,052 1,012,869
Total indebtedness $ 4,128,092 $ 4,670,896