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Supplemental Guarantor Information - Additional Information (Details)
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Dec. 31, 2014
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| Debt Disclosure [Abstract] | |
| Senior notes interest rate | 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage |
| Percentage of subsidiaries owned | 100.00%wti_PercentageOfSubsidiaryOwnedByParent |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Parent's ownership percentage of certain subsidiaries. No definition available.
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