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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net cash provided from operating activities included:      
Income taxes (refunded from) paid to taxing authorities $ (347) $ 386 $ 675
Interest paid 159,137 153,249 133,103
Non-cash investing and financing activities included:      
Asset retirement costs capitalized, net 76,373 [1] 57,982 [1] 24,061 [1]
Increase (decrease) in accrued capital expenditures $ 27,079 $ (94,121) $ 86,561
[1] Includes cost incurred whether capitalized or expensed.