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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Loss Carryforwards [Line Items] |  |  |
Deferred income tax expense | $ (122,137)us-gaap_DeferredIncomeTaxExpenseBenefit | $ 18,749 us-gaap_DeferredIncomeTaxExpenseBenefit | $ 6,316 us-gaap_DeferredIncomeTaxExpenseBenefit
Income taxes payable | 308 lamr_IncomeTaxesReceivablePayable | 848 lamr_IncomeTaxesReceivablePayable |
Income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Net operating loss subject to IRC 382 | 6,063 lamr_OperatingLossCarryforward |  |
Amounts of credits available to offset income tax | 4,822 us-gaap_TaxCreditCarryforwardAmount |  |
Net change in total valuation allowance | 2,322 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 1,087 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 332 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Deferred tax assets valuation expected rate | 0.00%lamr_DeferredTaxAssetsValuationExpectedRate |  |
Net operating income | 278,670 us-gaap_OperatingIncomeLoss | 223,437 us-gaap_OperatingIncomeLoss | 214,526 us-gaap_OperatingIncomeLoss
Potential deferred tax liability | 8,326 lamr_DeferredTaxLiabilitiesUnrecognizedUndistributedForeignEarnings |  |
Undistributed earnings of subsidiaries | 23,789 lamr_UndistributedForeignSubsidiariesEarnings |  |
Unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefits | 35 us-gaap_UnrecognizedTaxBenefits | 75 us-gaap_UnrecognizedTaxBenefits
LAMAR MEDIA CORP [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred income tax expense | (155,528)us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 18,885 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6,426 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income taxes payable | 308 lamr_IncomeTaxesReceivablePayable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 630 lamr_IncomeTaxesReceivablePayable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net operating loss subject to IRC 382 | 6,063 lamr_OperatingLossCarryforward / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Amounts of credits available to offset income tax | 19,593 us-gaap_TaxCreditCarryforwardAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Net change in total valuation allowance | 1,751 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,085 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 356 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Deferred tax assets valuation expected rate | 0.00%lamr_DeferredTaxAssetsValuationExpectedRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Net operating income | 279,015 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 223,772 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 214,862 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Potential deferred tax liability | 8,326 lamr_DeferredTaxLiabilitiesUnrecognizedUndistributedForeignEarnings / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Undistributed earnings of subsidiaries | 23,789 lamr_UndistributedForeignSubsidiariesEarnings / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 75 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
REIT Conversion [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred income tax expense | 120,081 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ExtraordinaryItemAxis = lamr_ReitConversionMember |  |
REIT Conversion [Member] | LAMAR MEDIA CORP [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred income tax expense | 153,472 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ExtraordinaryItemAxis = lamr_ReitConversionMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amounts of credits available to offset income tax | 241 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
State net operating loss carry forward | 449,691 lamr_StateOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Valuation allowance for State and Local deferred tax assets | 0 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 2,323 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
State and Local Jurisdiction [Member] | LAMAR MEDIA CORP [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amounts of credits available to offset income tax | 241 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
State net operating loss carry forward | 411,970 lamr_StateOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Valuation allowance for State and Local deferred tax assets | 0 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,751 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
U S [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
US net operating loss carry forwards | 257,839 lamr_UsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_US |  |
U S [Member] | LAMAR MEDIA CORP [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
US net operating loss carry forwards | 122,078 lamr_UsOperatingLossCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementGeographicalAxis = country_US |  |
Puerto Rico [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amounts of credits available to offset income tax | 209 us-gaap_TaxCreditCarryforwardAmount / us-gaap_StatementGeographicalAxis = country_PR |  |
Puerto Rico net operating loss carry forward | 28,354 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_PR |  |
Net operating income | 1,454 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = country_PR |  |
Puerto Rico [Member] | LAMAR MEDIA CORP [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Amounts of credits available to offset income tax | 209 us-gaap_TaxCreditCarryforwardAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementGeographicalAxis = country_PR |  |
Puerto Rico net operating loss carry forward | 28,354 us-gaap_OperatingLossCarryforwards / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementGeographicalAxis = country_PR |  |
Net operating income | $ 1,454 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementGeographicalAxis = country_PR |  |

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