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Supplemental Oil and Gas Disclosures (Unaudited) - Information About Results of Operations of Oil and Natural Gas Interests (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Consolidated entities |  |  |
Results of operations | $ (5,777) | $ (170,567) | $ (19,703)
Consolidated Entities |  |  |
Consolidated entities |  |  |
Revenues | 10,111 | 51,553 | 82,919
Production costs | (4,392) | (19,820) | (19,727)
Exploration costs | (124) | (11,864) | (17,416)
Depreciation, depletion, amortization | (2,157) | (28,774) | (29,442)
Results of Operations, Impairment of Oil and Gas Properties | (612) | (164,831) | (32,665)
Oil and gas administrative expenses | (8,700) | (11,700) | (17,000)
Results of Operations, Accretion of Asset Retirement Obligations | (56) | (144) | (121)
Income tax expenses | (20) | 14,717 | 13,398
Results of operations | (5,950) | (170,863) | (20,054)
Equity Method Investee |  |  |
Consolidated entities |  |  |
Royalty revenues | 284 | 428 | 786
Production costs | (76) | (102) | (105)
Oil and gas administrative expenses | (35) | (51) | (95)
Income tax expenses | 0 | 21 | (235)
Results of operations | $ 173 | $ 296 | $ 351

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- Definition Accretion expense of asset retirement obligations related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + 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=68064819&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=68064819&loc=d3e62136-109447 + Details
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- Definition Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense. + 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 (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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