|
Significant Accounting Policies - Percentage of Revenue by Major Customers (Parenthetical) (Details) (ConocoPhillips)
|
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2012
Entity
|
||||
|
Companies Separated Into Two
|
||||
| Entity Wide Revenue Major Customer [Line Items] | ||||
| Number of companies separated |
2wti_NumberOfCompaniesSeparated / us-gaap_InvestmentTypeAxis = wti_HoldingsMember / us-gaap_MajorCustomersAxis = wti_ConocoPhillipsMember |
|||
|
Sales Revenue Net | Customer Concentration Risk
|
||||
| Entity Wide Revenue Major Customer [Line Items] | ||||
| Percentage of receipts |
16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = wti_ConocoPhillipsMember |
[1] | ||
|
Sales Revenue Net | Companies Separated Into Two | Customer Concentration Risk
|
||||
| Entity Wide Revenue Major Customer [Line Items] | ||||
| Percentage of receipts |
8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_InvestmentTypeAxis = wti_HoldingsMember / us-gaap_MajorCustomersAxis = wti_ConocoPhillipsMember |
|||
|
||||
| X | ||||||||||
|
- Definition
For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Number of companies separated. No definition available.
|