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Supplemental Oil and Gas Disclosures - Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquisition costs:
Proved oil and gas properties	$ 260,034	$ 61,874	$ 781,522
Unproved oil and gas properties	696,293	5,424	672
Exploration costs	53,928	11,600	1,792
Development costs	923,562	511,905	207,766
Asset retirement costs	5,804	(2,965)	26,795
Total costs incurred	$ 1,939,621	$ 587,838	$ 1,018,547

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- Definition

Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period.

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Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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