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Significant Accounting Policies - Revenue and Expense Recognized for Advertising Barter Transactions (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Net revenues $ 7,839lamr_AdvertisingBarterTransactionNetRevenue $ 7,862lamr_AdvertisingBarterTransactionNetRevenue $ 6,798lamr_AdvertisingBarterTransactionNetRevenue
Direct advertising expenses 2,928lamr_AdvertisingBarterTransactionDirectAdvertisingExpenses 3,005lamr_AdvertisingBarterTransactionDirectAdvertisingExpenses 2,900lamr_AdvertisingBarterTransactionDirectAdvertisingExpenses
General and administrative expenses $ 4,675lamr_AdvertisingBarterTransactionGeneralAndAdministrativeExpenses $ 4,417lamr_AdvertisingBarterTransactionGeneralAndAdministrativeExpenses $ 3,699lamr_AdvertisingBarterTransactionGeneralAndAdministrativeExpenses