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Income Taxes - U.S. and Foreign Components of Earnings Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Components Of Earnings From Continuing Operations Before Income Taxes And Provision For Income Taxes [Line Items] |  |  |
U.S. | $ 144,298 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 62,506 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 17,279 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign | (872)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 474 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | (1,147)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (loss) before income tax expense | 143,426 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 62,980 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16,132 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
LAMAR MEDIA CORP [Member] |  |  |
Components Of Earnings From Continuing Operations Before Income Taxes And Provision For Income Taxes [Line Items] |  |  |
U.S. | 144,643 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 62,841 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 17,615 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Foreign | (872)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 474 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (1,147)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Income (loss) before income tax expense | $ 143,771 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 63,315 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 16,468 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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