Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Incentive Compensation Expense (Details)

v2.4.1.9
Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Incentive Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation charged to operating income $ 2,816us-gaap_ShareBasedCompensation $ 3,758us-gaap_ShareBasedCompensation
Total charged to operating income 2,944wti_IncentiveCompensationChargedToOperatingIncomeLoss 6,841wti_IncentiveCompensationChargedToOperatingIncomeLoss
General and Administrative    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation charged to operating income 2,816us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
3,758us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Cash-based incentive compensation charged to operating income (233)wti_CashBasedIncentiveCompensationChargedToOperatingIncomeLoss
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
[1] 1,781wti_CashBasedIncentiveCompensationChargedToOperatingIncomeLoss
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
[1]
Lease Operating Expense    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Cash-based incentive compensation charged to operating income $ 361wti_CashBasedIncentiveCompensationChargedToOperatingIncomeLoss
/ us-gaap_IncomeStatementLocationAxis
= wti_LeaseOperatingExpenseMember
$ 1,302wti_CashBasedIncentiveCompensationChargedToOperatingIncomeLoss
/ us-gaap_IncomeStatementLocationAxis
= wti_LeaseOperatingExpenseMember
[1] Adjustments to true up estimates to actual payments resulted in net credit balances to expense for the three months ended March 31, 2015.