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Property, Plant and Equipment - Summary of Major Categories of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment | 3,110,385 us-gaap_PropertyPlantAndEquipmentGross | $ 3,036,456 us-gaap_PropertyPlantAndEquipmentGross
Land [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment | 316,798 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 312,883 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Land [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life |  |
Land [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life |  |
Building and Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment | 132,360 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember | 125,724 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Building and Improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life | 10 years |
Building and Improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life | 39 years |
Advertising Structures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment | 2,520,644 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = lamr_AdvertisingStructuresMember | 2,459,425 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = lamr_AdvertisingStructuresMember
Advertising Structures [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life | 5 years |
Advertising Structures [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life | 15 years |
Automotive and Other Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment | 140,583 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = lamr_AutomotiveAndOtherEquipmentMember | $ 138,424 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = lamr_AutomotiveAndOtherEquipmentMember
Automotive and Other Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life | 3 years |
Automotive and Other Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, Estimated life | 7 years |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |