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Oil and Gas Properties - Net Capitalized Costs Related to Oil and Gas Producing Activities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Extractive Industries [Abstract]    
Unproved oil and gas properties $ 44,387 $ 90,446
Proved oil and gas properties 133,246 221,299
Total costs 177,633 311,745
Less: accumulated depreciation, depletion and amortization (55,858) (48,252)
Net capitalized costs $ 121,775 $ 263,493