Operating Segments - Operating Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 522,478	$ 465,234	$ 1,559,442	$ 1,363,052
Operating income (loss)	53,935	(13,269)	152,088	76,894
Total assets	2,699,410		2,699,410		2,584,583
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenues	522,478	465,234	1,559,442	1,363,052
Affiliate revenues	2,751	2,544	9,234	7,164
Operating income (loss)	53,644	(15,219)	149,326	71,465
Total assets	810,598	766,882	810,598	766,882
Reportable Segment [Member] | Broadcast Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	176,062	96,549	498,199	240,941
Affiliate revenues	118	128	754	634
Operating income (loss)	7,541	(11,334)	10,900	(7,699)
Total assets	293,260	182,470	293,260	182,470
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	123,406	128,715	372,962	382,542
Affiliate revenues	1,930	1,953	6,938	5,370
Operating income (loss)	13,984	8,311	37,494	32,347
Total assets	222,800	236,213	222,800	236,213
Reportable Segment [Member] | Industrial Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	167,008	159,342	515,621	502,615
Affiliate revenues	475	310	1,254	911
Operating income (loss)	22,926	7,017	71,719	52,715
Total assets	237,366	236,840	237,366	236,840
Reportable Segment [Member] | Industrial IT Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	56,002	56,309	172,660	163,422
Affiliate revenues	228	153	288	249
Operating income (loss)	9,193	8,446	27,935	23,941
Total assets	57,172	58,530	57,172	58,530
All Other [Member]
Segment Reporting Information [Line Items]
Revenues		24,319		73,532
Operating income (loss)		(27,659)	1,278	(29,839)
Total assets		$ 52,829		$ 52,829