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Oil and Gas Properties - Net Capitalized Costs Related to Oil and Gas Producing Activities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Extractive Industries [Abstract]    
Unproved oil and gas properties $ 97,824 $ 100,320
Proved oil and gas properties 201,905 155,262
Total capitalized costs 299,729 255,582
Less: accumulated depreciation, depletion and amortization (39,974) (22,941)
Net capitalized costs $ 259,755 $ 232,641