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Commitments - Additional Information (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Commitments [Line Items] | |||
| Minimum future lease payments due under noncancelable operating leases, 2015 | $ 1.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent | ||
| Minimum future lease payments due under noncancelable operating leases, 2016 | 1.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears | ||
| Minimum future lease payments due under noncancelable operating leases, 2017 | 1.6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears | ||
| Minimum future lease payments due under noncancelable operating leases, 2018 | 1.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears | ||
| Minimum future lease payments due under noncancelable operating leases, thereafter | 7.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter | ||
| Total rent expense | 3.2us-gaap_OperatingLeasesRentExpenseNet | 2.6us-gaap_OperatingLeasesRentExpenseNet | 1.7us-gaap_OperatingLeasesRentExpenseNet |
| Security amount requirement | 64.0us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases | ||
| Additional security requirements for 2015 | 9.0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary | ||
| Additional security requirements for 2016 | 6.0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary | ||
| Additional security requirements for 2017 | 4.0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary | ||
| Additional security requirements for 2018 | 5.0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary | ||
| Additional security requirements for 2019 to 2023 | 15.0us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears | ||
| Total security requirement | 103.0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount | ||
| Lease expiration date | Dec. 31, 2023 | ||
| Expenses related to bonds | 4.1wti_ExpenseRelatingToBonds | 5.0wti_ExpenseRelatingToBonds | 2.9wti_ExpenseRelatingToBonds |
| Other commitments | 5.8us-gaap_OtherCommitmentDueInNextTwelveMonths | ||
| Future estimated costs, 2016 | 5.8us-gaap_OtherCommitmentDueInSecondYear | ||
| Future estimated costs, 2017 | 5.4us-gaap_OtherCommitmentDueInThirdYear | ||
| Future estimated costs, 2018 | 5.2us-gaap_OtherCommitmentDueInFourthYear | ||
| Future estimated costs, thereafter | 32.9us-gaap_OtherCommitmentDueAfterFifthYear | ||
| Drilling Rig Commitments | |||
| Commitments [Line Items] | |||
| Minimum future lease payments due under noncancelable operating leases, 2014 |
12.6us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = wti_DrillingRigCommitmentsMember |
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| Helix Well Containment Group | |||
| Commitments [Line Items] | |||
| Other commitments |
2.1us-gaap_OtherCommitmentDueInNextTwelveMonths / us-gaap_OtherCommitmentsAxis = wti_HelixWellContainmentGroupMember |
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| Future estimated costs, 2016 |
2.1us-gaap_OtherCommitmentDueInSecondYear / us-gaap_OtherCommitmentsAxis = wti_HelixWellContainmentGroupMember |
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| Other commitment | |||
| Commitments [Line Items] | |||
| Security requirement minimum |
74.0wti_BondingRequirementRelatedToPurchaseOfPropertiesMinimumAmount / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = wti_OtherCommitmentMember |
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| Security requirement maximum |
$ 94.0wti_BondingRequirementRelatedToPurchaseOfPropertiesMaximumAmount / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = wti_OtherCommitmentMember |
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- Definition
Date which lease or group of leases is set to expire, in CCYY-MM-DD format. No definition available.
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. No definition available.
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- Definition
Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Minimum amount of other commitment maturing after the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the fourth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the next fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the second fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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- Definition
Minimum amount of other commitment maturing in the third fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. No definition available.
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| X | ||||||||||
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- Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The total bonding requirement over a period as defined on the contractual arrangement from the purchase of properties the amount is conditioned on certain factors and this is the maximum amount. No definition available.
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- Definition
The total bonding requirement over a period as defined on the contractual arrangement from the purchase of properties the amount is conditioned on certain factors and this is the minimum amount. No definition available.
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- Details
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- Definition
Expense related to bonds paid. No definition available.
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- Details
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- Details
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- Details
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