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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 | $ 50,199 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 22,043 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 5,646 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax adjustment related to REIT | (44,891)us-gaap_IncomeTaxReconciliationOtherAdjustments |  |
State and local income taxes, net of federal income tax benefit | 1,017 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 3,585 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,541 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Book expenses not deductible for tax purposes | 2,061 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,351 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,058 us-gaap_IncomeTaxReconciliationNondeductibleExpense
Stock-based compensation | (33)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 65 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 270 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Valuation allowance |  | (1,097)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (331)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Rate change | 91 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (2,565)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 49 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Deferred tax adjustment due to REIT conversion | (120,081)us-gaap_DeferredOtherTaxExpenseBenefit |  |
Other differences, net | 1,545 us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (541)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 9 us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense | (110,092)us-gaap_IncomeTaxExpenseBenefit | 22,841 us-gaap_IncomeTaxExpenseBenefit | 8,242 us-gaap_IncomeTaxExpenseBenefit
LAMAR MEDIA CORP [Member] |  |  |
Schedule Of Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Income tax expense at U.S. federal statutory rate | 50,320 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 22,160 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,764 us-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 | 1,017 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 3,601 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,557 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Book expenses not deductible for tax purposes | 2,061 us-gaap_IncomeTaxReconciliationNondeductibleExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,351 us-gaap_IncomeTaxReconciliationNondeductibleExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,058 us-gaap_IncomeTaxReconciliationNondeductibleExpense / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Stock-based compensation | (33)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 65 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 270 us-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 | 91 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (2,565)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 49 us-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 | 1,764 us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (541)us-gaap_IncomeTaxReconciliationOtherReconcilingItems / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 9 us-gaap_IncomeTaxReconciliationOtherReconcilingItems / 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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g),(h) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32059-109318 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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