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Depreciation and Amortization - Depreciation and Amortization Expense Excluded from Operating Expenses in its Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Component Of Other Income And Expense [Line Items]
Depreciation and amortization	$ 258,435us-gaap_DepreciationAmortizationAndAccretionNet	$ 300,579us-gaap_DepreciationAmortizationAndAccretionNet	$ 296,083us-gaap_DepreciationAmortizationAndAccretionNet
Direct Expenses [Member]
Component Of Other Income And Expense [Line Items]
Depreciation and amortization	241,471us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = lamr_AdvertisementExpenseMember	283,280us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = lamr_AdvertisementExpenseMember	277,662us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = lamr_AdvertisementExpenseMember
General and Administrative Expenses [Member]
Component Of Other Income And Expense [Line Items]
Depreciation and amortization	4,534us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	4,684us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	4,137us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Corporate Expenses [Member]
Component Of Other Income And Expense [Line Items]
Depreciation and amortization	$ 12,430us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = lamr_CorporateExpensesMember	$ 12,615us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = lamr_CorporateExpensesMember	$ 14,284us-gaap_DepreciationAmortizationAndAccretionNet / us-gaap_IncomeStatementLocationAxis = lamr_CorporateExpensesMember

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- Definition

The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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