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Property, Plant and Equipment - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Impairment charge	$ 2,319,000	$ 24,000	$ 4,825,997,000	$ 653,000
Proved Oil And Gas Properties
Property, Plant and Equipment [Line Items]
Estimate of future asset retirement costs	42,300,000		42,300,000		$ 42,300,000
Impairment loss		0	4,400,000,000	0
Proved Oil And Gas Properties | Williston Basin
Property, Plant and Equipment [Line Items]
Impairment loss			3,800,000,000
Proved Oil And Gas Properties | Delaware Basin
Property, Plant and Equipment [Line Items]
Impairment loss			637,300,000
Unproved Oil And Gas Properties
Property, Plant and Equipment [Line Items]
Impairment charge	800,000		292,100,000	700,000
Other Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Estimate of future asset retirement costs	1,400,000		1,400,000		$ 1,400,000
Other Property, Plant and Equipment | Williston Basin and Delaware Basin
Property, Plant and Equipment [Line Items]
Impairment charge			108,300,000
Midstream Assets
Property, Plant and Equipment [Line Items]
Impairment charge	$ 600,000	$ 0	$ 600,000	$ 0

X

- Definition

The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets.

+ References

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-Publisher FASB
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Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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