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Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Reporting_Unit Billboard Transit State | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of advertising displays | 144,000 lamr_NumberOfAdvertisingDisplays |  |
Number of states in which the company operates | 44 us-gaap_NumberOfStatesInWhichEntityOperates |  |
Number of states in which the company operates logo sign business | 23 lamr_NumberOfStatesInWhichEntityOperatesWithLogoSignBusiness |  |
Number of transit advertising displays | 41,000 lamr_NumberOfTransitAdvertisingDisplays |  |
Number of states in which the company operates | 16 lamr_NumberOfStatesInWhichEntityOperatesWithTransitAdvertisingBusiness |  |
Number of reporting units | 2 us-gaap_NumberOfReportingUnits |  |
REIT threshold percentage of taxable income to be distributed to stockholders | 90.00%lamr_PercentageNetIncomeAvailableForDividendDistribution |  |
Distributions paid, preferred stockholders | $ 365 us-gaap_DividendsPreferredStock | $ 365 us-gaap_DividendsPreferredStock | $ 365 us-gaap_DividendsPreferredStock
Distributions paid, preferred stockholders, per share | $ 63.80 lamr_PreferredStockDividendShares | $ 63.80 lamr_PreferredStockDividendShares | $ 63.80 lamr_PreferredStockDividendShares
Dilutive shares | 0 lamr_DilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0 lamr_DilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0 lamr_DilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Non cash compensation expense | 24,120 us-gaap_ShareBasedCompensation | 24,936 us-gaap_ShareBasedCompensation | 14,466 us-gaap_ShareBasedCompensation
Investment maturity period | Three months or less |  |
LAMAR MEDIA CORP [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of advertising displays | 144,000 lamr_NumberOfAdvertisingDisplays / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Number of states in which the company operates | 44 us-gaap_NumberOfStatesInWhichEntityOperates / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Number of states in which the company operates logo sign business | 23 lamr_NumberOfStatesInWhichEntityOperatesWithLogoSignBusiness / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Non cash compensation expense | 24,120 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 24,936 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 14,466 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
One-time Special Cash Distribution [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Distributions paid | 39,915 us-gaap_PaymentsOfDividends / us-gaap_DividendsAxis = lamr_SpecialDistributionMember |  |
Distributions paid, per share | $ 0.42 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = lamr_SpecialDistributionMember |  |
Taxable Income Distribution [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Distributions paid | 198,520 us-gaap_PaymentsOfDividends / us-gaap_DividendsAxis = lamr_TaxableIncomeDistributionMember |  |
Distributions paid, per share | $ 2.08 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = lamr_TaxableIncomeDistributionMember |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non cash compensation expense | 9,652 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Performance-Based Stock Incentive Program [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non cash compensation expense | 14,210 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = lamr_PerformanceBasedStockIncentiveProgramMember |  |
Stock Awards to Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non cash compensation expense | $ 258 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = lamr_StockAwardsToDirectorsMember |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Estimated useful lives of Intangible assets | 3 years |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Estimated useful lives of Intangible assets | 15 years |  |

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