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Supplemental Information on Oil and Gas Exploration and Productions Activities (Unaudited) - Results of Operations for Producing Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Results of Operations, Expense from Oil and Gas Producing Activities [Abstract] |  |
Production revenue | $ 49,201 | $ 48,834
Royalty and overriding royalty revenue | 4,364 | 10,732
Total oil and gas related revenue | 53,565 | 59,566
Depreciation, depletion and amortization | 40,772 | 23,936
Property, franchise and other taxes | 5,210 | 5,529
Production costs | 12,871 | 12,544
Impairment of oil and gas properties | 367,576 | 0
Total operating costs and expense | 426,429 | 42,009
Total income from operations | (372,864) | 17,557
Nonproduction revenue | $ 400 | $ 1,900

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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 3: 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=56944662&loc=d3e3602-108585 + Details
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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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