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Long-term Debt - Schedule of Maturities of Long Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
March 31, 2015-March 31, 2016 [Member]  
Debt Instrument [Line Items]  
Principal payment amount $ 3,750us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= lamr_MarchThirtyOneTwoThousandFifteenToMarchThirtyOneTwoThousandSixteenMember
June 30, 2016- March 31, 2017 [Member]  
Debt Instrument [Line Items]  
Principal payment amount 5,625us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= lamr_JuneThirtyTwoThousandSixteenToMarchThirtyFirstTwoThousandSeventeenMember
June 30, 2017-December 31, 2018 [Member]  
Debt Instrument [Line Items]  
Principal payment amount 11,250us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= lamr_JuneThirtyTwoThousandSeventeenToDecemberThirtyOneTwoThousandEighteenMember
Term A Loan Maturity Date [Member]  
Debt Instrument [Line Items]  
Principal payment amount $ 168,750us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= lamr_TermaLoanMaturityDateMember