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Non-cash Financing and Investing Activities - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items] |  |
Non-cash acquisition of capital expenditures and outdoor advertising assets | $ 1,900,000 lamr_NonCashAcquisitionOfOutdoorAdvertisingAssets | $ 4,982,000 lamr_NonCashAcquisitionOfOutdoorAdvertisingAssets
Treasury stock retired shares | 17,270,930 us-gaap_TreasuryStockSharesRetired |
Treasury stock retired value | 896,818,000 us-gaap_TreasuryStockRetiredParValueMethodAmount |
Non-cash financing activity |  | 0 lamr_NonCashFinancingTransaction
LAMAR MEDIA CORP [Member] |  |
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items] |  |
Non-cash acquisition of capital expenditures and outdoor advertising assets | 1,900,000 lamr_NonCashAcquisitionOfOutdoorAdvertisingAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4,982,000 lamr_NonCashAcquisitionOfOutdoorAdvertisingAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Non-cash financing activity | $ 0 lamr_NonCashFinancingTransaction / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0 lamr_NonCashFinancingTransaction / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition Non-cash acquisition of outdoor advertising assets. + References No definition available. + Details
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- Definition Transaction affecting assets or liabilities which did not result in cash receipts or payments during the period. + References No definition available. + Details
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- Definition Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the par value method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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