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Acquisitions - Pro Forma Effect on Operating Results (Detail) (PPC Broadband And Miranda Technologies [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
PPC Broadband And Miranda Technologies [Member]
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Revenues	$ 2,163,302	$ 2,280,189
Income from continuing operations	$ 78,827	$ 108,117
Diluted income per share from continuing operations	$ 1.72	$ 2.25

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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