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

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