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Crude Oil and Natural Gas Property Information - Schedule of Costs Incurred in Oil and Gas Property Acquisition Exploration and Development Activities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oil and Gas Exploration and Production Industries Disclosures [Abstract]      
Property Acquisition Costs - Proved $ 557 $ 48,917 $ 16,604
Property Acquisition Costs - Unproved 168,492 409,529 546,881
Total property acquisition costs 169,049 458,446 563,485
Exploration Costs 241,523 863,606 687,767
Development Costs 2,148,530 3,670,448 2,549,203
Total $ 2,559,102 $ 4,992,500 $ 3,800,455