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Income Taxes - Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax [Line Items] |  |  |
U.S. federal, Current | $ 8,721 us-gaap_CurrentFederalTaxExpenseBenefit | $ 930 us-gaap_CurrentFederalTaxExpenseBenefit |
State and local, Current | 2,632 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 1,609 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 823 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign, Current | 692 us-gaap_CurrentForeignTaxExpenseBenefit | 1,553 us-gaap_CurrentForeignTaxExpenseBenefit | 1,103 us-gaap_CurrentForeignTaxExpenseBenefit
Total Current | 12,045 us-gaap_CurrentIncomeTaxExpenseBenefit | 4,092 us-gaap_CurrentIncomeTaxExpenseBenefit | 1,926 us-gaap_CurrentIncomeTaxExpenseBenefit
U.S. federal, Deferred | (119,014)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 21,681 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 6,743 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local, Deferred | (2,909)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,165 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 826 us-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 | 18,749 us-gaap_DeferredIncomeTaxExpenseBenefit | 6,316 us-gaap_DeferredIncomeTaxExpenseBenefit
U.S. federal, Total | (110,293)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 22,611 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 6,743 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State and local, Total | (277)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 2,774 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 1,649 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign, Total | 478 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | (2,544)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | (150)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Income tax expense | (110,092)us-gaap_IncomeTaxExpenseBenefit | 22,841 us-gaap_IncomeTaxExpenseBenefit | 8,242 us-gaap_IncomeTaxExpenseBenefit
LAMAR MEDIA CORP [Member] |  |  |
Income Tax [Line Items] |  |  |
U.S. federal, Current | 8,993 us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 930 us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
State and local, Current | 2,579 us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,609 us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 824 us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Foreign, Current | 692 us-gaap_CurrentForeignTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,553 us-gaap_CurrentForeignTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,103 us-gaap_CurrentForeignTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total Current | 12,264 us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4,092 us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,927 us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
U.S. federal, Deferred | (151,191)us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 21,798 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6,859 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
State and local, Deferred | (4,124)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,184 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 820 us-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 | 18,885 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6,426 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
U.S. federal, Total | (142,198)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 22,728 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6,859 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
State and local, Total | (1,545)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,793 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,644 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Foreign, Total | 479 us-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 | $ 22,977 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 8,353 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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