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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
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.