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Information about Geographic Areas - Additional Information (Detail) (Foreign Countries [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net carrying value of long lived assets	$ 7,324us-gaap_NoncurrentAssets	$ 8,838us-gaap_NoncurrentAssets
External Customers [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	$ 33,124us-gaap_Revenues / us-gaap_MajorCustomersAxis = lamr_ExternalCustomersMember / us-gaap_StatementGeographicalAxis = lamr_ForeignCountriesMember	$ 34,013us-gaap_Revenues / us-gaap_MajorCustomersAxis = lamr_ExternalCustomersMember / us-gaap_StatementGeographicalAxis = lamr_ForeignCountriesMember	$ 32,761us-gaap_Revenues / us-gaap_MajorCustomersAxis = lamr_ExternalCustomersMember / us-gaap_StatementGeographicalAxis = lamr_ForeignCountriesMember

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Balance Type:	credit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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