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Asset Retirement Obligation (Schedule Of ARO Activity) (Detail) (Asset Retirement Obligation Costs [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Asset Retirement Obligation Costs [Member] |  |
Beginning balance | $ 59,380 us-gaap_AssetRetirementObligation / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember | $ 56,849 us-gaap_AssetRetirementObligation / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember
Adjustment due to change in estimate of related costs | (5,391)us-gaap_AssetRetirementObligationRevisionOfEstimate / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember | 806 us-gaap_AssetRetirementObligationRevisionOfEstimate / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember
Accretion of liability | 7,858 us-gaap_AssetRetirementObligationAccretionExpense / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember | 5,106 us-gaap_AssetRetirementObligationAccretionExpense / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember
Liabilities settled | (5,802)us-gaap_AssetRetirementObligationLiabilitiesSettled / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember | (3,323)us-gaap_AssetRetirementObligationLiabilitiesSettled / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember
Foreign Currency | (1,834)us-gaap_AssetRetirementObligationForeignCurrencyTranslation / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember | (58)us-gaap_AssetRetirementObligationForeignCurrencyTranslation / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember
Ending balance | $ 54,211 us-gaap_AssetRetirementObligation / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember | $ 59,380 us-gaap_AssetRetirementObligation / us-gaap_RegulatoryAssetAxis = us-gaap_AssetRetirementObligationCostsMember

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationAccretionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationForeignCurrencyTranslation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationLiabilitiesSettled
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationRevisionOfEstimate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration