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Property, Plant and Equipment - Additional Information (Detail) $ in Thousands, MMcf / d in Millions		12 Months Ended
	Nov. 06, 2017 MMcf / d	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Impairment charge		$ 384,228	$ 6,887	$ 4,684
Carrying value of assets		7,027,109	6,173,486	5,919,567
Proved oil and gas properties
Property, Plant and Equipment [Line Items]
Asset retirement costs		40,500	38,400
Impairment charge		3,600
Other property and equipment
Property, Plant and Equipment [Line Items]
Asset retirement costs		1,300	1,500
Unproved oil and gas properties
Property, Plant and Equipment [Line Items]
Impairment charge		900	$ 6,900	$ 1,100
Midstream Services | Proved oil and gas properties
Property, Plant and Equipment [Line Items]
Impairment charge		2,400
Exploration and Production | Proved oil and gas properties
Property, Plant and Equipment [Line Items]
Impairment charge		1,100
Affiliated Entity | Gas Gathering, Compression, Processing and Gas Lift Agreement | Contract for Construction of Natural Gas Processing Plant
Property, Plant and Equipment [Line Items]
Processing plant capacity (in cubic ft per day) | MMcf / d	200
Affiliated Entity | Gas Gathering, Compression, Processing and Gas Lift Agreement | Estimated Reimbursements, Plant II
Property, Plant and Equipment [Line Items]
Estimate of reimbursable amounts from OMP		$ 66,700

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Processing Plant Capacity

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

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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount of transactions with related party during the financial reporting period.

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