XML 23 R46.htm IDEA: XBRL DOCUMENT v2.4.1.9
Acquisitions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Total purchase price of outdoor advertising assets paid in cash $ 65,021us-gaap_PaymentsToAcquireBusinessesGross $ 92,248us-gaap_PaymentsToAcquireBusinessesGross
Total acquired intangible assets 53,790us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles 79,784us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Portion of acquired intangible assets assigned to goodwill 9,457lamr_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount 18,631lamr_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount
Amount deductible for tax purposes 9,457us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount 18,582us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Aggregate amortization expense related to acquisition 1,452lamr_AmortizationOfAcquiredIntangibleAsset 2,158lamr_AmortizationOfAcquiredIntangibleAsset
Total purchase price of outdoor advertising assets   97,230us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Non cash consideration of outdoor advertising assets   4,982lamr_BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsiderationOne
Gain on exchange of outdoor advertising assets   67lamr_BusinessAcquisitionGainLossRecognized
Other [Member]    
Business Acquisition [Line Items]    
Total acquired intangible assets 44,333us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember		 61,153us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Weighted average useful life 14 years 14 years
Customer Lists and Contracts [Member]    
Business Acquisition [Line Items]    
Total acquired intangible assets 7,216us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lamr_CustomerListsAndContractsMember		 10,390us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lamr_CustomerListsAndContractsMember
Weighted average useful life 7 years 7 years
Site Locations [Member]    
Business Acquisition [Line Items]    
Total acquired intangible assets $ 36,982us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lamr_SiteLocationsMember		 $ 50,333us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= lamr_SiteLocationsMember
Weighted average useful life 15 years 15 years