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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,108,541us-gaap_FiniteLivedIntangibleAssetsGross	$ 2,065,875us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization	1,741,556us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	1,646,490us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Goodwill gross carrying amount	1,766,304us-gaap_GoodwillGross	1,757,089us-gaap_GoodwillGross
Goodwill accumulated amortization	253,536lamr_GoodwillAccumulatedAmortization	253,536lamr_GoodwillAccumulatedAmortization
LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,107,997us-gaap_FiniteLivedIntangibleAssetsGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	2,065,330us-gaap_FiniteLivedIntangibleAssetsGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated Amortization	1,741,479us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,646,411us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Goodwill gross carrying amount	1,755,283us-gaap_GoodwillGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,746,068us-gaap_GoodwillGross / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Goodwill accumulated amortization	252,667lamr_GoodwillAccumulatedAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	252,667lamr_GoodwillAccumulatedAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	3 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Customer Lists and Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	499,310us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember	492,299us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember
Accumulated Amortization	470,170us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember	463,188us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember
Customer Lists and Contracts [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	499,311us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	492,299us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated Amortization	470,170us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	463,188us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_CustomerListsAndContractsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Customer Lists and Contracts [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	7 years
Customer Lists and Contracts [Member] | Minimum [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	7 years
Customer Lists and Contracts [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	10 years
Customer Lists and Contracts [Member] | Maximum [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	10 years
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	64,062us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	63,933us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Accumulated Amortization	63,192us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	62,914us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Non-competition Agreements [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	64,062us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	63,933us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated Amortization	63,192us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	62,914us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Non-competition Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	3 years
Non-competition Agreements [Member] | Minimum [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	3 years
Non-competition Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Non-competition Agreements [Member] | Maximum [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Site Locations [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,531,161us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember	1,495,635us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember
Accumulated Amortization	1,194,709us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember	1,106,947us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember
Site Locations [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,531,161us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,495,635us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated Amortization	1,194,709us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,106,945us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = lamr_SiteLocationsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Site Locations [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Site Locations [Member] | Maximum [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,008us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	14,008us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization	13,485us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	13,441us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Other [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,463us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	13,463us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accumulated Amortization	13,408us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 13,364us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	5 years
Other [Member] | Minimum [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	5 years
Other [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Other [Member] | Maximum [Member] | LAMAR MEDIA CORP [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years

X

- Definition

The accumulated amount of amortization of goodwill as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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