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Supplemental Oil and Gas Disclosures (Unaudited) - Additional Information (Detail) bbl in Thousands, Mcf in Thousands | 12 Months Ended
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Dec. 31, 2016 well $ / MMBTU $ / Boe bbl Mcf | Dec. 31, 2015 Boe well | Dec. 31, 2015 Boe $ / MMBTU | Dec. 31, 2015 Boe bbl | Dec. 31, 2015 Boe Mcf | Dec. 31, 2015 Boe $ / Boe | Dec. 31, 2014 Boe well $ / MMBTU $ / Boe bbl Mcf
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
New well addition | well |  | 0 | 36 |  |  |  |  | 106
Crude Oil and NGL |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Average spot price | $ / Boe |  | 42.75 |  |  |  |  | 50.28 | 94.99
Natural Gas in Mmbtu |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Average spot price | $ / MMBTU |  | 2.48 |  | 2.59 |  |  |  | 4.35
Consolidated Entities |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, revisions of previous estimates |  |  |  |  |  |  |  | 608
Oil | Consolidated Entities |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, sales of minerals in place | [1] | 4,460 |  |  | 704 |  |  | 105
Proved developed and undeveloped reserves, revisions of previous estimates | [1] | (11) |  |  | 855 |  |  | 608
Extensions and discoveries (added) | [1] | 29 |  |  | 224 |  |  | 2,191
New PDP Reserves | Consolidated Entities |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Extensions and discoveries (added) |  |  |  |  |  |  |  | 694
New PUD Reserves | Consolidated Entities |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Extensions and discoveries (added) |  |  |  |  |  |  |  | 913
Oil Less Natural Gas Liquids | Consolidated Entities |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, sales of minerals in place | [1] | 4,155 |  |  |  |  |  |
Natural Gas Liquids | Consolidated Entities |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, sales of minerals in place |  | 305 |  |  |  |  |  |
Natural Gas | Consolidated Entities |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Proved developed and undeveloped reserves, sales of minerals in place | Mcf |  | 3,756 |  |  |  | 1,223 |  | 218
Proved developed and undeveloped reserves, revisions of previous estimates |  | 631 |  |  | 1,995 | 1,675 |  | 293
Extensions and discoveries (added) | Mcf |  | 0 |  |  |  | 173 |  | 774
BOE |  |  |  |  |  |  |  |
Supplemental Oil And Gas Reserve Information [Line Items] |  |  |  |  |  |  |  |
Proved undeveloped reserve (Energy) | Boe |  |  | 0 | 0 | 0 | 0 | 0 | 2,703,000
[1] | Includes natural gas liquids (NGLs).

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