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

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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.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

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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

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-Topic 210

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-Section S99

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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

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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