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Schedule III - Schedule of Real Estate and Accumulated Depreciation (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 Displays | Dec. 31, 2013 | Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of advertising displays | 317,597 us-gaap_SECScheduleIIIRealEstateNumberOfUnits |  |
Encumbrances | $ 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances |  |
Initial Cost | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements |  |
Gross Carrying Amount | 2,520,644,000 us-gaap_RealEstateGrossAtCarryingValue | 2,459,425,000 us-gaap_RealEstateGrossAtCarryingValue | 2,378,940,000 us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation | (1,903,434,000)us-gaap_RealEstateAccumulatedDepreciation | (1,799,325,000)us-gaap_RealEstateAccumulatedDepreciation | (1,657,784,000)us-gaap_RealEstateAccumulatedDepreciation
Construction Date | Various |  |
Acquisition Date | Various |  |
LAMAR MEDIA CORP [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of advertising displays | 317,597 us-gaap_SECScheduleIIIRealEstateNumberOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Initial Cost | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Gross Carrying Amount | 2,520,644,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,459,425,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,378,940,000 us-gaap_RealEstateGrossAtCarryingValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated Depreciation | $ (1,903,434,000)us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (1,799,325,000)us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (1,657,784,000)us-gaap_RealEstateAccumulatedDepreciation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Construction Date | Various |  |
Acquisition Date | Various |  |
Minimum [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful Lives | 5 years |  |
Minimum [Member] | LAMAR MEDIA CORP [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful Lives | 5 years |  |
Maximum [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful Lives | 20 years |  |
Maximum [Member] | LAMAR MEDIA CORP [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful Lives | 20 years |  |

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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition Initial cost of buildings and improvements for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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