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Summary of Significant Accounting Policies - Results of Operations for Properties (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Oil And Gas Properties Sold [Abstract] |  |  |  |  |
Total oil and gas sales |  | $ 4,535 | $ 11,881 | $ 17,747 | $ 25,416
Total operating expenses | [1] | (1,743) | (12,293) | (6,134) | (26,598)
Operating income (loss) |  | $ 2,792 | $ (412) | $ 11,613 | $ (1,182)
[1] | Includes direct operating expenses, depreciation, depletion and amortization and exploration expense and excludes interest and general and administrative expense. No depreciation, depletion and amortization expense has been provided for subsequent to the date the assets were designated as held for sale.

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- Definition Oil and gas properties sold oil and gas sales. + References No definition available. + Details
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- Definition Oil and gas properties sold operating expenses. + References No definition available. + Details
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- Definition Oil and gas properties sold operating income loss. + References No definition available. + Details
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