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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
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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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- Definition 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) + Details
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