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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
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment	3,110,385us-gaap_PropertyPlantAndEquipmentGross	$ 3,036,456us-gaap_PropertyPlantAndEquipmentGross
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	316,798us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember	312,883us-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	132,360us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember	125,724us-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	2,520,644us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = lamr_AdvertisingStructuresMember	2,459,425us-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	140,583us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = lamr_AutomotiveAndOtherEquipmentMember	$ 138,424us-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

X

- 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

X

- Details

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

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=lamr_AutomotiveAndOtherEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: