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Long-term Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Long Term Debt | $ 1,899,895 us-gaap_LongTermDebt | $ 1,938,802 us-gaap_LongTermDebt
Less current maturities | (15,625)us-gaap_LongTermDebtCurrent | (55,935)us-gaap_LongTermDebtCurrent
Long-term debt excluding current maturities | 1,884,270 us-gaap_LongTermDebtNoncurrent | 1,882,867 us-gaap_LongTermDebtNoncurrent
LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 1,899,895 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,938,802 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Less current maturities | (15,625)us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (55,935)us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Long-term debt excluding current maturities | 1,884,270 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,882,867 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Senior Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 353,750 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_SeniorCreditFacilityMember | 502,106 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_SeniorCreditFacilityMember
Senior Credit Facility [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 353,750 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_SeniorCreditAgreementMember | 502,106 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_SeniorCreditAgreementMember
7 7/8% Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 400,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_SevenPointSevenByEightPercentSeniorSubordinatedNotesDueTwoThousandEighteenMember
7 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 400,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_SevenPointSevenByEightPercentSeniorSubordinatedNotesDueTwoThousandEighteenMember
5 7/8% Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 500,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_FivePointSevenByEightPercentSeniorSubordinateNotesMember | 500,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_FivePointSevenByEightPercentSeniorSubordinateNotesMember
5 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 500,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePointSevenByEightPercentSeniorSubordinateNotesMember | 500,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePointSevenByEightPercentSeniorSubordinateNotesMember
5% Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 535,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_FivePercentSeniorSubordinateNotesMember | 535,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_FivePercentSeniorSubordinateNotesMember
5% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 535,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePercentSeniorSubordinateNotesMember | 535,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePercentSeniorSubordinateNotesMember
5 3/8% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 510,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_FivePointThreeByEightPercentSeniorNotesMember |
5 3/8% Senior Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 510,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePointThreeByEightPercentSeniorNotesMember |
Other Notes with Various Rates and Terms [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 1,145 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_OtherNotesWithVariousRatesAndTermsMember | 1,696 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lamr_OtherNotesWithVariousRatesAndTermsMember
Other Notes with Various Rates and Terms [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | $ 1,145 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_OtherNotesWithVariousRatesAndTermsMember | $ 1,696 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_OtherNotesWithVariousRatesAndTermsMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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