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Acquisitions - Summary of Preliminary Allocation of Acquisition Costs (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Property, plant and equipment	$ 74,326	$ 12,319
Goodwill	60,968	775
Other asset	7,763	356
Current liabilities	(3,424)	(211)
Long-term liabilities	(6,140)
Total	230,009	23,497
Site locations [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Site locations, Non-competition agreements, Customer lists and contracts	78,288	8,147
Non-competition agreements [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Site locations, Non-competition agreements, Customer lists and contracts	80	101
Customer lists and contracts [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Site locations, Non-competition agreements, Customer lists and contracts	$ 18,148	$ 2,010

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The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

+ References

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-Name Statement of Financial Accounting Standard (FAS)

-Number 141

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The amount of acquisition cost of a business combination allocated to current liabilities of the acquired entity.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of acquisition cost of a business combination allocated to noncurrent liabilities of the acquired entity.

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Amount of acquisition cost of a business combination allocated to other assets not separately disclosed in the balance sheet.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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