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Income Taxes - Income Tax Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax [Line Items]      
U.S. federal, Current $ 8,721us-gaap_CurrentFederalTaxExpenseBenefit $ 930us-gaap_CurrentFederalTaxExpenseBenefit  
State and local, Current 2,632us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,609us-gaap_CurrentStateAndLocalTaxExpenseBenefit 823us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign, Current 692us-gaap_CurrentForeignTaxExpenseBenefit 1,553us-gaap_CurrentForeignTaxExpenseBenefit 1,103us-gaap_CurrentForeignTaxExpenseBenefit
Total Current 12,045us-gaap_CurrentIncomeTaxExpenseBenefit 4,092us-gaap_CurrentIncomeTaxExpenseBenefit 1,926us-gaap_CurrentIncomeTaxExpenseBenefit
U.S. federal, Deferred (119,014)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 21,681us-gaap_DeferredFederalIncomeTaxExpenseBenefit 6,743us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local, Deferred (2,909)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,165us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 826us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign, Deferred (214)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (4,097)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,253)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total, Deferred (122,137)us-gaap_DeferredIncomeTaxExpenseBenefit 18,749us-gaap_DeferredIncomeTaxExpenseBenefit 6,316us-gaap_DeferredIncomeTaxExpenseBenefit
U.S. federal, Total (110,293)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 22,611us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 6,743us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State and local, Total (277)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 2,774us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,649us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign, Total 478us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations (2,544)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations (150)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Income tax expense (110,092)us-gaap_IncomeTaxExpenseBenefit 22,841us-gaap_IncomeTaxExpenseBenefit 8,242us-gaap_IncomeTaxExpenseBenefit
LAMAR MEDIA CORP [Member]      
Income Tax [Line Items]      
U.S. federal, Current 8,993us-gaap_CurrentFederalTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
930us-gaap_CurrentFederalTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
State and local, Current 2,579us-gaap_CurrentStateAndLocalTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,609us-gaap_CurrentStateAndLocalTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
824us-gaap_CurrentStateAndLocalTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Foreign, Current 692us-gaap_CurrentForeignTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,553us-gaap_CurrentForeignTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,103us-gaap_CurrentForeignTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total Current 12,264us-gaap_CurrentIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,092us-gaap_CurrentIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,927us-gaap_CurrentIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
U.S. federal, Deferred (151,191)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
21,798us-gaap_DeferredFederalIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
6,859us-gaap_DeferredFederalIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
State and local, Deferred (4,124)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,184us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
820us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Foreign, Deferred (213)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(4,097)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(1,253)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total, Deferred (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
U.S. federal, Total (142,198)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
22,728us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
6,859us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
State and local, Total (1,545)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2,793us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,644us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Foreign, Total 479us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(2,544)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(150)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
/ 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