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Oil and natural gas properties (under successful efforts accounting) (Tables)
 9 Months Ended
Sep. 30, 2015
Extractive Industries [Abstract]  
Components of Oil and Natural Gas Properties
Oil and natural gas properties are comprised of the following:
 
 
September 30,
2015
 
December 31, 2014
Oil and natural gas properties
$
3,578,864

 
$
2,838,573

Less: accumulated depletion
(2,036,467
)
 
(1,942,380
)
Oil and natural gas properties, net
$
1,542,397

 
$
896,193