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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Costs Incurred for Property Acquisition, Exploration and Development (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Acquisitions      
Acreage purchases [1] $ 57,324 $ 62,390 $ 62,075
Oil and gas properties [1] 0 1,683 18,269
Development [1] 666,984 834,552 1,177,526
Exploration:      
Exploration drilling costs incurred [1] 0 1,380 2,030
Gas gathering facilities:      
Development [1] 3,583 10,218 15,097
Subtotal [1] 764,574 944,340 1,328,659
Asset retirement obligations [1] 11,193 28,826 20,245
Total costs incurred [1] 775,767 973,166 1,348,904
Expense      
Exploration:      
Exploration costs incurred [1] 35,117 32,196 50,920
Stock-based compensation expense [1] $ 1,566 $ 1,921 $ 2,742
[1] Includes cost incurred whether capitalized or expensed.