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Supplemental Oil and Gas Disclosures - Capitalized Costs Related to Oil and Natural Gas Producing Activities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Proved oil and gas properties	$ 7,878,104	$ 7,058,782
Less: Accumulated depreciation, depletion, amortization and impairment	(2,853,353)	(2,395,153)
Proved oil and gas properties, net	5,024,751	4,663,629
Unproved oil and gas properties	1,034,085	780,173
Total oil and gas properties, net	$ 6,058,836	$ 5,443,802

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Oil and Gas properties with proved reserves under the successful effort method, net of accumulated depreciation, depletion, amortization and impairment.

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Net amount of capitalized costs relating to oil and gas producing activities.

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Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

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Oil and Gas properties with proved reserves under the successful effort method.

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Oil and Gas properties with unproved reserves under the successful effort method.

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