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Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) bbl / d Mcf / d	Dec. 31, 2019 USD ($)
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	3,000
2027
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day	18,000
2033
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day	25,000
2034 Through 2035
Commitments And Contingencies Disclosure [Line Items]
Delivery commitments contingent upon pipeline construction or modification per day	10,000
Divestiture Contract Obligation
Commitments And Contingencies Disclosure [Line Items]
Accrued obligations | $	$ 484.1
Natural Gas
Commitments And Contingencies Disclosure [Line Items]
Transportation commitments contingent upon pipeline construction or modification | Mcf / d	25,000
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract	6 years
Impairment of Proved Property and Other Assets
Commitments And Contingencies Disclosure [Line Items]
Impairment of ROU Asset | $	$ 2.0	$ 2.1

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Commitments and contingencies disclosures.

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Maximum remaining terms of leases and concessions on undeveloped acreage.

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Period remaining on lease and concession for oil and gas undeveloped acreage, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (b)

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Amount of loss from impairment of right-of-use asset from operating lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121593497&loc=SL77918431-209957

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-Topic 420
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