Acquisitions - Additional Information (Detail) (USD $)	9 Months Ended					12 Months Ended			12 Months Ended						12 Months Ended
	Jul. 27, 2012	Dec. 31, 2012	Dec. 10, 2012	Jul. 30, 2012	Dec. 31, 2011	Dec. 31, 2012 Miranda Technologies Inc [Member]	Jul. 27, 2012 Miranda Technologies Inc [Member]	Dec. 31, 2011 Miranda Technologies Inc [Member]	Dec. 31, 2011 Miranda Technologies Inc [Member] Order or Production Backlog [Member]	Jan. 07, 2011 ICM Corp. [Member]	Mar. 31, 2011 Poliron Cabos Electricos Especiais Ltda [Member]	Aug. 31, 2011 Byres Security, Inc. [Member]	Dec. 31, 2011 Thomas & Betts [Member]	Nov. 19, 2010 Thomas & Betts [Member]	Dec. 31, 2012 PPC Broadband Inc [Member]	Dec. 10, 2012 PPC Broadband Inc [Member]	Dec. 31, 2011 Series of individually immaterial business acquisitions [Member]	Dec. 31, 2012 GarrettCom [Member]	Dec. 31, 2011 GarrettCom [Member]	Dec. 31, 2010 GarrettCom [Member]	Dec. 05, 2010 GarrettCom [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired	97.37%									100.00%						100.00%					100.00%
Acquisition price/cash paid at closing	$ 364,800,000			$ 9,900,000						$ 21,800,000	$ 28,700,000	$ 7,200,000		$ 77,200,000		$ 521,400,000			$ 47,300,000		$ 56,600,000
Fair value of acquired receivables	27,600,000		28,800,000											6,700,000						5,100,000
Acquired receivable, gross contractual amount	28,300,000		29,300,000											7,000,000						5,300,000
Amount of acquired receivables not expected to be collected	700,000		500,000											300,000						200,000
Goodwill acquired															277,200,000
Revenues						73,600,000									9,800,000
Income from continuing operations						11,500,000									2,000,000
Inventory fair value						10,600,000									2,900,000
Amortization of intangible assets						10,900,000			6,700,000						1,700,000
Transaction costs associated with the acquisition						2,500,000									1,000,000
Percentage of remaining shares acquired	2.63%
Inventory cost step-up								19,200,000
Transaction costs								3,500,000
Goodwill		439,696,000			27,891,000	162,764,000	162,764,000						29,335,000	29,335,000	277,187,000	277,187,000	27,800,000			24,059,000	24,059,000
Business acquisition purchase price allocation intangible asset																	21,300,000
Cash paid subsequent to closing																		4,100,000	4,100,000
Remaining cash to be paid																		$ 1,100,000