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v2.4.1.9

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

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- Definition Accounts Payable To Associated Companies + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Aggregate amount payable under the service contract. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Capital Contribution To Affiliate + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gains arising from related party transactions which are deferred to be recognized in a future period. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest owned in service contract. + References No definition available. + Details
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Balance Type: | na
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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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |