XML 95 R77.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Oil and Gas Reserves Information (Unaudited) - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2016 $ / bbl $ / Mcf | Dec. 31, 2015 $ / bbl $ / Mcf
Crude Oil and NGL Per Barrel |  |
Average Sales Price And Production Costs Per Unit Of Production [Line Items] |  |
Average sales prices | $ / bbl | 37.62 | 46.88
Natural Gas Per Thousand Cubic Feet |  |
Average Sales Price And Production Costs Per Unit Of Production [Line Items] |  |
Average sales prices | $ / Mcf | 2.29 | 2.34

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
Name: | us-gaap_AverageSalesPrices
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis=us-gaap_CrudeOilAndNGLPerBarrelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis=us-gaap_NaturalGasPerThousandCubicFeetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |