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Summary of Significant Accounting Policies - Summary of Unaudited Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Total oil and gas sales	$ 179,535		$ 128,116		$ 405,413	$ 254,997
Net income (loss)	$ (49,876)	$ 42,028	$ 21,407	$ 13,575	$ (7,848)	$ 34,982
Net income (loss) per share:
Basic	$ (0.29)		$ 0.20		$ (0.15)	$ 0.33
Diluted	$ (0.29)		$ 0.20		$ (0.15)	$ 0.33
Pro Forma
Total oil and gas sales			$ 295,547			$ 610,850
Net income (loss)			$ 102,506			$ 164,583
Net income (loss) per share:
Basic			$ 0.50			$ 0.79
Diluted			$ 0.36			$ 0.59

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