Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Additional Information (Details)

v2.4.1.9
Supplemental Oil and Gas Disclosures - Additional Information (Details)
12 Months Ended
Dec. 31, 2014
Reserve Quantities [Line Items]  
Percentage non-operated non-producing reserves 11.00%wti_PercentageOfNonOperatedProvedDevelopedNonProducingReserves
Present value discounted percentage 10.00%wti_PresentValueDiscountedPercentage
Gulf of Mexico  
Reserve Quantities [Line Items]  
Percentage of oil, NGLs and natural gas reserves 69.00%wti_PercentageOfOilAndNaturalGasReserves
/ us-gaap_StatementGeographicalAxis
= wti_GulfOfMexicoMember
Minimum  
Reserve Quantities [Line Items]  
Expected time to evaluate properties, in years 1 year
Maximum  
Reserve Quantities [Line Items]  
Expected time to evaluate properties, in years 5 years