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Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting) (Tables)
 3 Months Ended
Mar. 31, 2017
Extractive Industries [Abstract]  
Components of Oil and Natural Gas Properties
Oil and natural gas properties are comprised of the following: 
 
March 31,
2017
 
December 31, 2016
Proved property
$
9,702,938

 
$
9,695,367

Unproved property
$
1,375,940

 
$
1,375,940

Total oil and natural gas properties, at cost
$
11,078,878

 
$
11,071,307

Less: accumulated impairment
$
(8,283,321
)
 
$
(8,283,321
)
Oil and natural gas properties, net of impairment
$
2,795,557

 
$
2,787,986

Less: accumulated depletion
(2,188,860
)
 
(2,166,643
)
Oil and natural gas properties, net
$
606,697

 
$
621,343