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Supplemental Oil and Gas Disclosures - Results of Operations for Oil and Natural Gas Producing Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |  |  |
Revenues | $ 721,672 | $ 1,304,004 | $ 1,084,412
Production costs | 245,675 | 326,381 | 221,095
Depreciation, depletion and amortization | 472,800 | 400,118 | 298,999
Exploration costs | 2,369 | 3,064 | 2,260
Rig termination | 3,895 | 0 | 0
Impairment of oil and gas properties | 46,109 | 47,238 | 1,168
Income tax expense (benefit) | (18,382) | 197,701 | 196,312
Results of operations for oil and natural gas producing activities | $ (30,794) | $ 329,502 | $ 364,578

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- Definition Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62136-109447 + Details
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- Definition Exploration costs from oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62136-109447 + Details
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- Definition Costs related to the impairment of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(3)(ii)(A)(1)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 + Details
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