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Long-term Debt - Long-Term Debt (Parenthetical) (Detail)	Apr. 18, 2014	Dec. 31, 2014	Apr. 22, 2010	Feb. 09, 2012	Oct. 30, 2012	Jan. 10, 2014
Debt Instrument [Line Items]
Interest rate on senior notes	7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
7 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_SevenPointSevenByEightPercentSeniorSubordinatedNotesDueTwoThousandEighteenMember	7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_SevenPointSevenByEightPercentSeniorSubordinatedNotesDueTwoThousandEighteenMember
7 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_SevenPointSevenByEightPercentSeniorSubordinatedNotesDueTwoThousandEighteenMember
5 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_FivePointSevenByEightPercentSeniorSubordinateNotesMember		5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_FivePointSevenByEightPercentSeniorSubordinateNotesMember
5 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePointSevenByEightPercentSeniorSubordinateNotesMember
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_FivePercentSeniorSubordinateNotesMember			5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_FivePercentSeniorSubordinateNotesMember
5% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePercentSeniorSubordinateNotesMember
5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_FivePointThreeByEightPercentSeniorNotesMember				5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lamr_FivePointThreeByEightPercentSeniorNotesMember
5 3/8% Senior Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Interest rate on senior notes		5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = lamr_FivePointThreeByEightPercentSeniorNotesMember

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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