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Natural Gas and Oil Exploration, Development and Production Activities - Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Natural gas properties: |  |  |
Properties subject to depletion | [1] | $ 11,450,212 | $ 11,058,771
Unproved properties | [1] | 844,308 | 819,656
Total | [1] | 12,294,520 | 11,878,427
Accumulated depletion and depreciation | [1] | (5,667,298) | (5,456,727)
Net capitalized costs | [1] | $ 6,627,222 | $ 6,421,700
[1] | Includes capitalized asset retirement costs and the associated accumulated amortization.

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- Definition Amount of accumulated depreciation, depletion, and amortization of oil and gas property accounted for under successful efforts method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
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- Definition Amount, before accumulated depreciation, depletion, amortization, and impairment, of oil and gas properties accounted for under successful efforts method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
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- Definition Amount, after accumulated depreciation, depletion, amortization, and impairment, of oil and gas properties accounted for under successful efforts method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
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- Definition Amount, before accumulated depreciation, depletion, amortization, and impairment, of oil and gas properties with proved reserve accounted for under successful efforts method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
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- Definition Amount, before accumulated depreciation, depletion, amortization, and impairment, of oil and gas properties with unproved reserve accounted for under successful efforts method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478810/932-360-50-1 + Details
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