Property, Plant and Equipment - Additional Information (Detail) - USD ($)	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Nov. 19, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Impairment charge	$ 0	$ 4,937,143,000	$ 10,257,000	$ 384,228,000
Proved Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Impairment charge		4,400,000,000	0	0
Proved Oil and Gas Properties | Williston Basin
Property, Plant and Equipment [Line Items]
Impairment charge		3,800,000,000
Proved Oil and Gas Properties | Permian Basin
Property, Plant and Equipment [Line Items]
Impairment charge		637,300,000
Unproved oil and gas properties
Property, Plant and Equipment [Line Items]
Impairment charge		401,100,000	5,400,000	900,000
Other property and equipment
Property, Plant and Equipment [Line Items]
Impairment charge		108,300,000	$ 0	$ 0
Other property and equipment | Midstream Equipment
Property, Plant and Equipment [Line Items]
Impairment charge		$ 1,600,000