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Income Taxes - Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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| Deferred Tax Assets: | ||
| Basis difference in fixed assets | $ 63,931us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | $ 31,440us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |
| Foreign tax credit carry forward | 48,928us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 55,908us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
| Alternative minimum tax credit carryover | 1,349us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 1,349us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |
| Foreign net operating losses | 44,228us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign | 42,688us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |
| Asset retirement obligations | 5,196us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations | 4,012us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations |
| Other | 3,828us-gaap_DeferredTaxAssetsOther | 3,300us-gaap_DeferredTaxAssetsOther |
| Deferred Tax Assets, Gross | 167,460us-gaap_DeferredTaxAssetsGross | 138,697us-gaap_DeferredTaxAssetsGross |
| Valuation allowance | (166,111)us-gaap_DeferredTaxAssetsValuationAllowance | (137,348)us-gaap_DeferredTaxAssetsValuationAllowance |
| Total deferred tax asset | $ 1,349us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 1,349us-gaap_DeferredTaxAssetsLiabilitiesNet |
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. No definition available.
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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