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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Natural gas properties: |  |  |
Properties subject to depletion | [1] | $ 10,592,394 | $ 10,435,611
Unproved properties | [1] | 800,994 | 789,871
Total | [1] | 11,393,388 | 11,225,482
Accumulated depletion and depreciation | [1] | (5,193,291) | (5,107,801)
Natural gas and oil properties, successful efforts method, net | [1] | $ 6,200,097 | $ 6,117,681
[1] | Includes capitalized asset retirement costs and the associated accumulated amortization.

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