Goodwill and Other Intangible Assets - Summary of Changes in Gross Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Goodwill [Line Items]
Goodwill, beginning balance	$ 1,738,686
Goodwill acquired during the year	18,631
Purchase price adjustments and other	(228)
Impairment losses
Goodwill, Ending balance	1,757,089
LAMAR MEDIA CORP [Member]
Goodwill [Line Items]
Goodwill, beginning balance	1,727,665
Goodwill acquired during the year	18,631
Purchase price adjustments and other	(228)
Impairment losses
Goodwill, Ending balance	$ 1,746,068

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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