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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Reconciliation Of Unrecognized Tax Benefits [Line Items] |  |
Beginning balance | $ 35 us-gaap_UnrecognizedTaxBenefits | $ 75 us-gaap_UnrecognizedTaxBenefits
Additions for tax positions related to current year |  | 1 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for tax positions related to prior years | 0 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount | 0 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
Reductions for tax positions related to prior years | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Lapse of statute of limitations | (35)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (41)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Settlements | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities
Ending Balance | 0 us-gaap_UnrecognizedTaxBenefits | 35 us-gaap_UnrecognizedTaxBenefits
LAMAR MEDIA CORP [Member] |  |
Reconciliation Of Unrecognized Tax Benefits [Line Items] |  |
Beginning balance | 35 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 75 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Additions for tax positions related to current year |  | 1 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Additions for tax positions related to prior years | 0 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Reductions for tax positions related to prior years | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Lapse of statute of limitations | (35)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (41)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Settlements | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Ending Balance | $ 0 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 35 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 1.N.Q3) -URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 1 -Section N + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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