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Non-Cash Financing and Investing Activities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Non-Cash Financing and Investing Activities (Textual) [Abstract]
Non-cash acquisition of outdoor advertising assets	$ 2,871
Deposits paid in prior periods for the purchase of an aircraft		$ 4,000

X

- Definition

Deposits paid in prior periods for purchase of aircraft.

+ References

No definition available.

+ Details

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X

- Definition

Non-cash acquisition of outdoor advertising assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	lamr_
Data Type:	xbrli:monetaryItemType
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X

- Details

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