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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Net cash provided from operating activities included: |  |
Income taxes (refunded) paid to taxing authorities | $ (119) | $ 246
Interest paid | 74,940 | 66,438
Non-cash investing and financing activities included: |  |
Asset retirement costs (removed) capitalized, net | (2,385) | 4,004
Increase (decrease) in accrued capital expenditures | $ 74,428 | $ (29,414)

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