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Schedule III - Schedule of Real Estate and Accumulated Depreciation (Parenthetical) (Detail)	12 Months Ended
	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	0lamr_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	0lamr_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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