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Supplementary Information - Reserve Quantity Information (Detail)
 12 Months Ended
Dec. 31, 2015
MBbls
MMcf
Dec. 31, 2014
MBbls
MMcf
Oil [Member]    
Proved Developed Reserves:    
Beginning of year 6,239 6,687
Extensions, discoveries and improved recovery 47 186
Revisions of previous estimates (1,650) (278)
Converted from undeveloped reserves 677 407
Reserves sold (53) (4)
Reserves purchased 39  
Production (720) (759)
End of year 4,579 6,239
Proved Undeveloped Reserves:    
Beginning of year 14,709 9,066
Extensions, discoveries and improved recovery 420 5,914
Revisions of previous estimates (14,400) 136
Converted to developed reserves (677) (407)
Reserves sold 0 0
Reserves purchased 0 0
End of year 52 14,709
Total Proved Reserves at the End of the Year 4,631 20,948
NGLs [Member]    
Proved Developed Reserves:    
Beginning of year 2,160 2,223
Extensions, discoveries and improved recovery 85 222
Revisions of previous estimates (560) (207)
Converted from undeveloped reserves 163 93
Reserves purchased 12  
Production (187) (171)
End of year 1,673 2,160
Proved Undeveloped Reserves:    
Beginning of year 4,322 3,707
Extensions, discoveries and improved recovery 101 1,629
Revisions of previous estimates (4,248) (921)
Converted to developed reserves (163) (93)
Reserves sold 0 0
Reserves purchased 0 0
End of year 12 4,322
Total Proved Reserves at the End of the Year 1,685 6,482
Gas [Member]    
Proved Developed Reserves:    
Beginning of year | MMcf 32,267 31,628
Extensions, discoveries and improved recovery | MMcf 2,067 424
Revisions of previous estimates | MMcf (8,368) 3,662
Converted from undeveloped reserves | MMcf 944 735
Reserves sold | MMcf (26)  
Reserves purchased | MMcf 372  
Production | MMcf (3,981) (4,182)
End of year | MMcf 23,275 32,267
Proved Undeveloped Reserves:    
Beginning of year | MMcf 26,331 19,772
Extensions, discoveries and improved recovery | MMcf 701 6,672
Revisions of previous estimates | MMcf (26,033) 622
Converted to developed reserves | MMcf (944) (735)
Reserves sold | MMcf 0 0
Reserves purchased | MMcf 0 0
End of year | MMcf 55 26,331
Total Proved Reserves at the End of the Year | MMcf 23,330 58,598