Quarterly report pursuant to Section 13 or 15(d)

Oil And Natural Gas Properties And Equipment (Narrative) (Detail)

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Oil And Natural Gas Properties And Equipment (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Oil And Natural Gas Properties And Equipment [Abstract]        
Fair value of fields     $ 410,423 $ 412,593
Impairment of proved properties $ 5,821 $ 11,220