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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Deferred gains	$ 85lamr_DeferredGainsFromRelatedPartyTransactions	$ 85lamr_DeferredGainsFromRelatedPartyTransactions
Receivables from employees	246us-gaap_DueFromEmployees	126us-gaap_DueFromEmployees
Interest owned in service contract	26.66%lamr_InterestOwnedInServiceContract
Aggregate amount payable under the service contract	1,914lamr_AggregateAmountPayableUnderServiceContract
LAMAR MEDIA CORP [Member]
Related Party Transaction [Line Items]
Amount payable to parent company	6,955lamr_AccountsPayableToAssociatedCompanies / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	7,665lamr_AccountsPayableToAssociatedCompanies / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Amount contributed to affiliate	$ 38,201lamr_CapitalContributionToAffiliate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 37,858lamr_CapitalContributionToAffiliate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition

Accounts Payable To Associated Companies

+ References

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- Definition

Aggregate amount payable under the service contract.

+ References

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- Definition

Capital Contribution To Affiliate

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- Definition

Gains arising from related party transactions which are deferred to be recognized in a future period.

+ References

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- Definition

Interest owned in service contract.

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- Definition

For an unclassified balance sheet, amounts due from an Entity employee, not to include stockholders or officers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Name Accounting Standards Codification

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