Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) bbl / d Mcf / d
Commitments And Contingencies Disclosure [Line Items]
Minimum remaining terms of leases on undeveloped acreage, in years	3 years
Maximum remaining terms of leases on undeveloped acreage, in years	5 years
2021
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day | bbl / d	3,000
2035
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day | bbl / d	10,000
Natural Gas
Commitments And Contingencies Disclosure [Line Items]
Transportation commitments contingent upon pipeline construction or modification	25,000
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract	6 years
Natural Gas | Late 2020
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day	35,000
Natural Gas | Late 2021
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day	50,000
Natural Gas | 2025 Through 2026
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day	15,000
Impairment of Proved Property and Other Assets
Commitments And Contingencies Disclosure [Line Items]
Impairment of ROU Asset | $	$ 2.1