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Commitments and Contingencies - Additional Information (Detail) $ in Thousands		12 Months Ended
	Mar. 23, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 01, 2019 USD ($) MBbls MMcf	Dec. 31, 2018 MBbls	Dec. 31, 2018 MMcf
Commitments And Contingencies [Line Items]
Other Commitment		$ 627,960
Rental expense		$ 10,600	$ 6,900	$ 6,300
Long term commitments
Commitments And Contingencies [Line Items]
Contract term, maximum		10 years
Crude oil | Long term commitments
Commitments And Contingencies [Line Items]
Minimum quantity of delivery | MBbls						46,100
Natural gas | Long term commitments
Commitments And Contingencies [Line Items]
Minimum quantity of delivery						42,800	879,500
Fresh Water | Long term commitments
Commitments And Contingencies [Line Items]
Minimum quantity to be purchased | MBbls						28,000
Volume Commitment Agreement
Commitments And Contingencies [Line Items]
Transportation and purchase costs incurred		$ 21,100	$ 14,800	$ 16,100
Pending Litigation | Mirada Litigation
Commitments And Contingencies [Line Items]
Damages sought (in excess of)	$ 100,000
Subsequent Event | Crude oil | Long term commitments
Commitments And Contingencies [Line Items]
Minimum quantity of delivery | MBbls					9,100
Subsequent Event | Natural gas | Long term commitments
Commitments And Contingencies [Line Items]
Minimum quantity of delivery | MMcf					200
Subsequent Event | Fresh Water | Long term commitments
Commitments And Contingencies [Line Items]
Minimum quantity to be purchased | MBbls					12,000
Water Volume Commitment Agreements | Subsequent Event
Commitments And Contingencies [Line Items]
Other Commitment					$ 72,900

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Total amount of product committed to be supplied under existing contracts or agreements.

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The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

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