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Acquisitions and Dispositions of Oil and Gas Properties - Results of Operations for Properties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oil And Gas Properties Sold [Abstract]      
Total oil and gas sales $ 7,480 $ 30,169 $ 32,984
Total operating expenses [1] (5,690) (83,275) (47,639)
Operating income (loss) $ 1,790 $ (53,106) $ (14,655)
[1] Includes direct operating expenses, depreciation, depletion and amortization and exploration expense. Excludes interest expense, general and administrative expenses and depreciation, depletion and amortization expense subsequent to the date the assets were designated as held for sale.