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Costs Incurred for Property Acquisition, Exploration and Development (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Acquisitions:      
Acreage purchases [1] $ 4,061   $ 57,324
Development [1] 124,180   666,984
Gas gathering facilities:      
Development [1] 2,047   3,583
Subtotal [1] 137,365   764,574
Asset retirement obligations 1,250 [1] $ 1,532 11,193 [1]
Total costs incurred [1] 138,615   775,767
Expense      
Exploration:      
Exploration costs incurred [1] 6,747   35,117
Stock-based compensation expense [1] $ 330   $ 1,566
[1] Includes costs incurred whether capitalized or expensed.