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Schedule III - Schedule of Real Estate and Accumulated Depreciation (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |
Number of single asset exceeded 5% of the total gross carrying amount | 0 lamr_NumberOfSingleAssetContributionOnGrossCarryingAmount
Percentage of asset contribution to total gross carrying amount | 5.00%lamr_PercentageOfAssetContributionOnGrossCarryingAmount
LAMAR MEDIA CORP [Member] |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |
Number of single asset exceeded 5% of the total gross carrying amount | 0 lamr_NumberOfSingleAssetContributionOnGrossCarryingAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Percentage of asset contribution to total gross carrying amount | 5.00%lamr_PercentageOfAssetContributionOnGrossCarryingAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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