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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquisitions      
Acreage purchases [1],[2] $ 33,142 $ 73,025 $ 226,475
Oil and gas properties [1],[2] 3,098,772 0 392,325
Asset retirement obligations and other [1],[2] 21,908 0 11,927
Development [1] 497,795 708,268 1,119,896
Exploration:      
Exploration drilling costs incurred [1] 37,680 87,505 180,925
Gas gathering facilities:      
Development [1] 3,595 13,337 13,137
Subtotal [1] 3,725,217 903,541 2,008,233
Asset retirement obligations [1],[3] (24,064) 22,184 56,822
Total costs incurred [1] 3,701,153 925,725 2,065,055
Expense      
Exploration:      
Exploration costs incurred [1] 30,027 18,421 58,979
Stock-based compensation expense [1] $ 2,298 $ 2,985 $ 4,569
[1] Includes cost incurred whether capitalized or expensed.
[2] See also Note 3 for additional information related to the 2014 Conger Exchange which includes $134.8 million of gas gathering assets received in the exchange.
[3] For additional information on non-cash investing activities associated with the MRD Merger, see Note 3