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Goodwill and Other Intangible Assets (Narrative) (Detail) (Dynamic Tower [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Dynamic Tower [Member]
Goodwill And Other Intangible Assets [Line Items]
Purchase price consideration, adjustment	$ 4.7

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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