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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Income tax expense at U.S. federal statutory rate	$ 50,199us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 22,043us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 5,646us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax adjustment related to REIT	(44,891)us-gaap_IncomeTaxReconciliationOtherAdjustments
State and local income taxes, net of federal income tax benefit	1,017us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	3,585us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,541us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Book expenses not deductible for tax purposes	2,061us-gaap_IncomeTaxReconciliationNondeductibleExpense	1,351us-gaap_IncomeTaxReconciliationNondeductibleExpense	1,058us-gaap_IncomeTaxReconciliationNondeductibleExpense
Stock-based compensation	(33)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	65us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	270us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Valuation allowance		(1,097)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(331)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Rate change	91us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(2,565)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	49us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Deferred tax adjustment due to REIT conversion	(120,081)us-gaap_DeferredOtherTaxExpenseBenefit
Other differences, net	1,545us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(541)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	9us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense	(110,092)us-gaap_IncomeTaxExpenseBenefit	22,841us-gaap_IncomeTaxExpenseBenefit	8,242us-gaap_IncomeTaxExpenseBenefit
LAMAR MEDIA CORP [Member]
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Income tax expense at U.S. federal statutory rate	50,320us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	22,160us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	5,764us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Tax adjustment related to REIT	(45,012)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
State and local income taxes, net of federal income tax benefit	1,017us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	3,601us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,557us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Book expenses not deductible for tax purposes	2,061us-gaap_IncomeTaxReconciliationNondeductibleExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,351us-gaap_IncomeTaxReconciliationNondeductibleExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,058us-gaap_IncomeTaxReconciliationNondeductibleExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Stock-based compensation	(33)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	65us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	270us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Valuation allowance		(1,094)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(354)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Rate change	91us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(2,565)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	49us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Deferred tax adjustment due to REIT conversion	(153,472)us-gaap_DeferredOtherTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other differences, net	1,764us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(541)us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	9us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income tax expense	$ (143,264)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 22,977us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 8,353us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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