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Supplemental Oil and Gas Disclosures (Unaudited) - Additional Information (Detail)
bbl in Thousands, Mcf in Thousands
12 Months Ended
Dec. 31, 2015
Well
Dec. 31, 2015
$ / MMBTU
Dec. 31, 2015
bbl
Dec. 31, 2015
$ / Boe
Dec. 31, 2015
Mcf
Dec. 31, 2014
Well
$ / MMBTU
$ / Boe
bbl
Mcf
Dec. 31, 2013
Well
$ / MMBTU
$ / Boe
bbl
Mcf
Supplemental Oil And Gas Reserve Information [Line Items]              
New well addition | Well 36         106 88
Crude Oil and NGL [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Average spot price | $ / Boe       50.28   94.99 96.91
Natural Gas in Mmbtu [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Average spot price | $ / MMBTU   2.59       4.35 3.67
Consolidated Entities [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates           608 1,243
Oil [Member] | Consolidated Entities [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Extensions and discoveries [1]     224     2,191 3,085
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place [1]     704     105  
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates [1]     855     608 182
Oil [Member] | Equity Method Investee [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates [1]     0     0 0
New PDP Reserves [Member] | Consolidated Entities [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Extensions and discoveries           694  
New PUD Reserves [Member] | Consolidated Entities [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Extensions and discoveries           913  
Natural Gas [Member] | Consolidated Entities [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Extensions and discoveries | Mcf         173 774 2,046
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place | Mcf         1,223 218  
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates     1,995   1,675 293 1,243
Natural Gas [Member] | Equity Method Investee [Member]              
Supplemental Oil And Gas Reserve Information [Line Items]              
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | Mcf         (320) (382) 7
[1] Includes natural gas liquids (NGLs).