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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
Jun. 30, 2014
Dec. 31, 2013
Oil and Gas Property [Abstract]    
Unproved oil and gas properties $ 97,058 $ 100,320
Proved oil and gas properties 188,220 155,262
Total capitalized costs 285,278 255,582
Less: accumulated depreciation, depletion and amortization (32,048) (22,941)
Net capitalized costs $ 253,230 $ 232,641