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Costs Incurred for Property Acquisition, Exploration and Development (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Acquisitions:      
Acreage purchases [1] $ 14,634   $ 62,390
Oil and gas properties [1]     1,683
Development [1] 209,827   834,552
Exploration:      
Exploration drilling costs incurred [1] 542   1,380
Gas gathering facilities:      
Development [1] 1,063   10,218
Subtotal [1] 234,276   944,340
Asset retirement obligations 1,532 [1] $ 5,063 28,826 [1]
Total costs incurred [1] 235,808   973,166
Expense      
Exploration:      
Exploration costs incurred [1] 7,837   32,196
Stock-based compensation expense [1] $ 373   $ 1,921
[1] Includes costs incurred whether capitalized or expensed.