Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Schedule of Depreciation, Depletion, Amortization and Accretion Expense (Details)

v2.4.1.9
Supplemental Oil and Gas Disclosures - Schedule of Depreciation, Depletion, Amortization and Accretion Expense (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Capitalized Costs Oil And Gas Producing Activities Net [Abstract]      
Depreciation, depletion, amortization and accretion per Boe 28.98wti_DepreciationDepletionAmortizationAndAccretionPerBoe 25.10wti_DepreciationDepletionAmortizationAndAccretionPerBoe 20.79wti_DepreciationDepletionAmortizationAndAccretionPerBoe