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Schedule III - Summary of Compnay's Real Estate Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Gross real estate assets: |  |
Balance at the beginning of the year | $ 2,459,425 us-gaap_RealEstateGrossAtCarryingValue | $ 2,378,940 us-gaap_RealEstateGrossAtCarryingValue
Additions for construction, acquisition, improvements to structures | 98,857 us-gaap_RealEstateImprovements | 112,459 us-gaap_RealEstateImprovements
Assets sold or written-off | (36,392)us-gaap_RealEstateCostOfRealEstateSold | (31,328)us-gaap_RealEstateCostOfRealEstateSold
Foreign exchange | (1,246)lamr_RealEstateForeignExchange | (646)lamr_RealEstateForeignExchange
Balance at the end of the year | 2,520,644 us-gaap_RealEstateGrossAtCarryingValue | 2,459,425 us-gaap_RealEstateGrossAtCarryingValue
Accumulated depreciation: |  |
Balance at the beginning of the year | 1,799,325 us-gaap_RealEstateAccumulatedDepreciation | 1,657,784 us-gaap_RealEstateAccumulatedDepreciation
Depreciation | 135,679 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense | 161,172 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Assets sold or written-off | (30,994)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold | (19,213)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
Foreign exchange | (576)lamr_RealEstateAccumulatedDepreciationForeignExchange | (418)lamr_RealEstateAccumulatedDepreciationForeignExchange
Balance at the end of the year | 1,903,434 us-gaap_RealEstateAccumulatedDepreciation | 1,799,325 us-gaap_RealEstateAccumulatedDepreciation
LAMAR MEDIA CORP [Member] |  |
Gross real estate assets: |  |
Balance at the beginning of the year | 2,459,425 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,378,940 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Additions for construction, acquisition, improvements to structures | 98,857 us-gaap_RealEstateImprovements / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 112,459 us-gaap_RealEstateImprovements / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Assets sold or written-off | (36,392)us-gaap_RealEstateCostOfRealEstateSold / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (31,328)us-gaap_RealEstateCostOfRealEstateSold / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Foreign exchange | (1,246)lamr_RealEstateForeignExchange / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (646)lamr_RealEstateForeignExchange / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Balance at the end of the year | 2,520,644 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,459,425 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated depreciation: |  |
Balance at the beginning of the year | 1,799,325 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,657,784 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Depreciation | 135,679 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 161,172 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Assets sold or written-off | (30,994)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (19,213)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Foreign exchange | (576)lamr_RealEstateAccumulatedDepreciationForeignExchange / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (418)lamr_RealEstateAccumulatedDepreciationForeignExchange / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Balance at the end of the year | $ 1,903,434 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 1,799,325 us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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