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Supplemental Information on Oil and Gas Exploration and Productions Activities (Unaudited) - Summary of Capitalized Costs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Extractive Industries [Abstract]    
Proven properties $ 199,404 $ 392,153
Unproven properties 0 46,400
Total property, plant, and equipment 199,404 438,553
Accumulated depreciation, depletion, and amortization (60,542) (18,993)
Net capitalized costs $ 138,862 $ 419,560