Acquisitions - Additional Information (Detail) (USD $)				0 Months Ended		0 Months Ended				12 Months Ended	0 Months Ended				0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 10, 2012 PPC Broadband Inc [Member]	Dec. 31, 2013 PPC Broadband Inc [Member]	Jul. 30, 2012 Miranda Technologies Inc [Member]	Jul. 27, 2012 Miranda Technologies Inc [Member]	Jul. 27, 2013 Miranda Technologies Inc [Member]	Dec. 31, 2011 Miranda Technologies Inc [Member]	Dec. 31, 2011 Miranda Technologies Inc [Member] Sales Backlog [Member]	Aug. 31, 2011 Byres Security, Inc. [Member]	Jan. 25, 2013 Softel Limited [Member]	Jan. 07, 2011 ICM Corp. [Member]	Dec. 31, 2013 ICM Corp. [Member]	Apr. 01, 2011 Poliron Cabos Electricos Especiais Ltda [Member]	Dec. 31, 2011 Series of individually immaterial business acquisitions [Member]
Business Acquisition [Line Items]
Acquisition price/cash paid at closing				$ 522,400,000		$ 9,900,000	$ 364,800,000				$ 7,200,000	$ 9,100,000	$ 21,800,000		$ 28,700,000
Percentage of outstanding shares acquired					100.00%	2.63%	97.37%							100.00%
Fair value of acquired receivables					26,600,000		27,600,000
Acquired receivable, gross contractual amount					27,700,000		28,300,000
Amount of acquired receivables not expected to be collected					1,100,000		700,000
Goodwill acquired					277,100,000
Inventory cost step-up									19,200,000
Amortization of intangible assets										6,700,000
Transaction costs									3,500,000
Goodwill	773,048,000	778,708,000	336,591,000	277,091,000				161,206,000								27,800,000
Business acquisition purchase price allocation intangible asset				$ 164,500,000				$ 159,991,000								$ 21,300,000