Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details)

v2.4.1.9

Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Oil
Reserve Quantities [Line Items]
Weighted price	91.12wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember	99.65wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember	98.13wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember	97.36wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_OilReservesMember
NGLs
Reserve Quantities [Line Items]
Weighted price	34.63wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember	35.21wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember	47.30wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember	51.30wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasLiquidsReservesMember
Natural Gas
Reserve Quantities [Line Items]
Weighted price	4.27wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember	3.80wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember	2.77wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember	4.11wti_WeightedAveragePricesUsedToEstimateReserves / us-gaap_ReserveQuantitiesByTypeOfReserveAxis = us-gaap_NaturalGasReservesMember