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Income Taxes - Components of Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Allowance for doubtful accounts | $ 255 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | $ 2,972 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Accrued liabilities not deducted for tax purposes | 4,703 lamr_DeferredTaxAssetsCurrentTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 37,764 lamr_DeferredTaxAssetsCurrentTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Asset retirement obligation | 79 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations | 70,166 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Net operating loss carry forwards | 11,881 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 138,865 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carry forwards | 209 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 4,844 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Charitable contributions carry forward | 9 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards | 9 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Property, plant and equipment | 65 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |
Investment in partnership | 354 us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries |
Gross deferred tax assets | 17,555 us-gaap_DeferredTaxAssetsGross | 254,620 us-gaap_DeferredTaxAssetsGross
Less: valuation allowance | (9)us-gaap_DeferredTaxAssetsValuationAllowance | (2,331)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | 17,546 us-gaap_DeferredTaxAssetsNet | 252,289 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |
Property, plant and equipment |  | (45,160)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangibles | (4,321)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (314,382)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Investment in partnerships |  | (1,519)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Gross deferred tax liabilities | (4,321)us-gaap_DeferredTaxLiabilities | (361,061)us-gaap_DeferredTaxLiabilities
Net deferred tax assets (liabilities) | 13,225 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | (108,772)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Classification in the consolidated balance sheets: |  |
Current deferred tax assets | 729 us-gaap_DeferredTaxAssetsNetCurrent | 10,378 us-gaap_DeferredTaxAssetsNetCurrent
Current deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilitiesCurrent | 0 us-gaap_DeferredTaxLiabilitiesCurrent
Noncurrent deferred tax assets | 12,496 us-gaap_DeferredTaxAssetsNetNoncurrent |
Noncurrent deferred tax liabilities |  | (119,150)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax assets (liabilities) | 13,225 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | (108,772)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
LAMAR MEDIA CORP [Member] |  |
Deferred tax assets: |  |
Allowance for doubtful accounts | 255 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,972 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accrued liabilities not deducted for tax purposes | 4,703 lamr_DeferredTaxAssetsCurrentTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 37,764 lamr_DeferredTaxAssetsCurrentTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Asset retirement obligation | 79 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 70,166 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net operating loss carry forwards | 11,881 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 89,496 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Tax credit carry forwards | 209 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 19,615 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Charitable contributions carry forward | 9 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 9 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Property, plant and equipment | 65 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Investment in partnership | 354 us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Gross deferred tax assets | 17,555 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 220,022 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Less: valuation allowance | (9)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (1,760)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net deferred tax assets | 17,546 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 218,262 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Deferred tax liabilities: |  |
Property, plant and equipment |  | (45,160)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Intangibles | (4,321)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (313,746)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Investment in partnerships |  | (1,519)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Gross deferred tax liabilities | (4,321)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (360,425)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net deferred tax assets (liabilities) | 13,225 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (142,163)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Classification in the consolidated balance sheets: |  |
Current deferred tax assets | 729 us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 10,378 us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Current deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Noncurrent deferred tax assets | 12,496 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Noncurrent deferred tax liabilities |  | (152,541)us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net deferred tax assets (liabilities) | $ 13,225 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (142,163)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from investments in unconsolidated subsidiaries and investments in other affiliates which are not controlled nor consolidated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31958-109318 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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