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Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Letters of credit with bank | $ 6,624,000 us-gaap_LettersOfCreditOutstandingAmount |  |
Employees eligibility | Completed one year of service and are at least 21 years of age |  |
Minimum years of service required to participate in Company sponsored saving and profit sharing plan | 1 year |  |
Minimum age required to participate in Company sponsored saving and profit sharing plan | 21 lamr_MinimumAgeRequiredToParticipateInCompanySponsoredSavingsAndProfitSharingPlan |  |
Employers contribution and compensation | Match 50% of employees' contributions up to 5% of eligible compensation |  |
Employers contribution as percentage of employees contribution | 50.00%lamr_EmployersContributionAsPercentageOfEmployeesContribution |  |
Employers contribution as percentage of employees compensation | 5.00%lamr_EmployersContributionAsPercentageOfEmployeesCompensation |  |
Employees contribution limit | 100.00%lamr_PercentageOfEmployeesContributionLimit |  |
Fully vesting period of contribution | 3 years |  |
Minimum age for entitlement to benefit of deferred compensation plan | 30 lamr_MinimumAgeForEntitlementToBenefitOfDeferredCompensationPlan |  |
Minimum years of experience to attain the benefit of deferred compensation plan | 10 years |  |
Deferred compensation arrangement with individual employees contribution minimum | 3,000 lamr_DeferredCompensationArrangementWithIndividualEmployeesContributionMinimum |  |
Deferred compensation arrangement with individual employees contribution maximum | 8,000 lamr_DeferredCompensationArrangementWithIndividualEmployeesContributionMaximum |  |
Deferred Profit Sharing [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Employer's contribution | 3,973,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember | 3,581,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember | 3,184,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember
Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Employer's contribution | $ 1,400,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = lamr_DeferredCompensationPlanMember | $ 1,323,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = lamr_DeferredCompensationPlanMember | $ 1,260,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = lamr_DeferredCompensationPlanMember

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- Definition Deferred compensation arrangement with individual employees contribution maximum. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred compensation arrangement with individual employees contribution minimum. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
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- Definition Employees eligibility. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Employers contribution and compensation. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Employers contribution as percentage of employees compensation. + References No definition available. + Details
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Namespace Prefix: | lamr_
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Balance Type: | na
Period Type: | duration

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- Definition Employers contribution as percentage of employees contribution. + References No definition available. + Details
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Balance Type: | na
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- Definition Minimum age for entitlement to benefit of deferred compensation plan. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:integerItemType
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Period Type: | duration

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- Definition Minimum years of age required. + References No definition available. + Details
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- Definition Minimum years of service required. + References No definition available. + Details
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Namespace Prefix: | lamr_
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- Definition Employees contribution limit. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Vesting period on entity matched contribution. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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- Details
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