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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, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Property, Plant and Equipment [Line Items]
Impairment charge		$ 6,887	$ 4,684	$ 46,109
Carrying value of assets		6,173,486	5,919,567	5,218,242
Proved oil and gas properties
Property, Plant and Equipment [Line Items]
Asset retirement costs		39,900	42,900
Impairment charge		3,600		9,400
Unproved oil and gas properties
Property, Plant and Equipment [Line Items]
Impairment charge		6,900	$ 1,100	36,600
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
Carrying value of assets				25,900
Estimated fair value of assets				$ 16,500
Affiliated Entity [Member] | Gas Gathering, Compression, Processing and Gas Lift Agreement [Member] | Contract for Construction of Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Processing plant capacity (in cubic ft per day) | MMcf / d	200
Affiliated Entity [Member] | Gas Gathering, Compression, Processing and Gas Lift Agreement [Member] | Estimated Reimbursements, Plant II [Member]
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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Fair value portion 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 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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