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Depreciation, Depletion, Amortization and Impairment Expense Related to Property and Equipment and Intangible Assets and Liabilities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property Plant And Equipment [Abstract] |  |  |
Depreciation and impairment expense | $ 753,510 | $ 657,571 | $ 845,543
Amortization expense | 21,764 | 3,643 | 3,643
Depletion expense | 8,067 | 7,220 | 15,573
Total | $ 783,341 | $ 668,434 | $ 864,759

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- Definition Amortization expense of intangible assets net of intangible liabilities. + References No definition available. + Details
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- Definition Depreciation and impairment losses. + References No definition available. + Details
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- Definition Depreciation depletion amortization and impairment. + References No definition available. + Details
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- Definition The noncash expense charged against earnings to recognize the consumption of natural resources. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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