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Property and Equipment - Components of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Abstract]    
Proved oil and gas properties, at cost $ 371,095 $ 364,123
Less: Accumulated depletion and depreciation (173,637) (169,100)
Oil and Gas Properties, Net 197,458 195,023
Field and office equipment 27,258 26,653
Less: Accumulated depreciation (13,808) (13,251)
Field and Office Equipment, Net 13,450 13,402
Total Property and Equipment, Net $ 210,908 $ 208,425