v3.3.1.900

Disclosures About Oil and Gas Producing Activities - Commodity Prices Inclusive of Adjustments for Quality and Location Used in Determining Future Net Revenues Related to Standardized Measure Calculation (Detail) - Reserve Estimate [Member] | 12 Months Ended
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Dec. 31, 2015 $ / bbl $ / Mcf | Dec. 31, 2014 $ / bbl $ / Mcf | Dec. 31, 2013 $ / bbl $ / Mcf
Oil (MBbls) [Member] |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Commodity Prices | 50.16 | 94.56 | 97.28
NGLs (MBbls) [Member] |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Commodity Prices | 15.13 | 31.50 | 30.16
Natural Gas (MMcf) [Member] |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Commodity Prices | $ / Mcf | 2.64 | 4.55 | 3.66

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