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Dispositions - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) a | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
(Loss) gain on the sale of assets | $ (426,000) |  | $ 5,867,000 |  | $ 121,673,000 | $ 5,678,000
Pennsylvania |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  | 5,900,000 |  |  |
Proceeds from sale of oil and gas properties |  |  | $ 34,000,000.0 |  |  |
Pennsylvania | Natural Gas and Oil Properties |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of acres sold | a |  |  | 20,000 |  |  |
Northwest Pennsylvania |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
(Loss) gain on the sale of assets |  | $ 122,500,000 |  |  |  |
Proceeds from sale of oil and gas properties |  | 1,000,000.0 |  |  |  |
Miscellaneous Proved, Unproved Properties and Surface Acreage |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
(Loss) gain on the sale of assets | (216,000) | (617,000) | $ 2,000 | $ (189,000) |  |
Proceeds from sale of oil and gas properties | $ 12,000 | $ 59,000 | $ 34,000 | $ 332,000 |  |

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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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