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Summarized Financial Information of Subsidiaries - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Balance of permitted transfers to parent company | $ 2,269,393 lamr_BalanceOfPermittedTransfersToParentCompany | $ 2,072,542 lamr_BalanceOfPermittedTransfersToParentCompany
Description of provisions on senior credit facility transfers to Lamar Advertising not subject to additional restrictions | (i) the total debt ratio is equal to or greater than 6.0 to 1 or (ii) the senior debt ratio is equal to or greater than 3.5 to 1. |
Debt ratio | 6.0 lamr_MinimumHoldingDebtRatioForApplicabilityOfRestrictionOnTransfer |
Description of actual position on senior credit facility transfers to Lamar Advertising not subject to additional restrictions | The total debt ratio was less than 6.0 to 1 and Lamar Media's senior debt ratio was less than 3.5 to 1; therefore, dividends or distributions to Lamar Advertising were not subject to any additional restrictions under the senior credit facility. |
Debt ratio related to actual position on senior credit facility | 6.0 lamr_MaximumActualHoldingsDebtRatio |
Senior Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Senior debt ratio | 3.5 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_LongtermDebtTypeAxis = lamr_SeniorCreditAgreementMember |
Senior Subordinated Notes [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Senior debt ratio | 3.5 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Balance of permitted transfers to parent company. + References No definition available. + Details
Name: | lamr_BalanceOfPermittedTransfersToParentCompany
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Description of Position on senior credit facility transfers to Parent Company not subject to additional restrictions. + References No definition available. + Details
Name: | lamr_DescriptionOfPositionOnSeniorCreditFacilityTransfersToParentCompanyNotSubjectToAdditionalRestrictions
Namespace Prefix: | lamr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of Provisions On senior credit facility transfers to Parent Company subject to additional restrictions. + References No definition available. + Details
Name: | lamr_DescriptionOfProvisionsOnSeniorCreditFacilityTransfersToParentCompanySubjectToAdditionalRestrictions
Namespace Prefix: | lamr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum actual holdings debt ratio. + References No definition available. + Details
Name: | lamr_MaximumActualHoldingsDebtRatio
Namespace Prefix: | lamr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum holding debt ratio for applicability of restriction on transfer. + References No definition available. + Details
Name: | lamr_MinimumHoldingDebtRatioForApplicabilityOfRestrictionOnTransfer
Namespace Prefix: | lamr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=lamr_SeniorCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorSubordinatedNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |