Operating Segments - Operating Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Dec. 31, 2012
Operating Statistics [Line Items]
Revenues	$ 529,491	$ 458,218	$ 1,036,964	$ 897,818
Operating income (loss)	53,913	53,037	98,153	90,163
Total assets	2,664,644		2,664,644		2,584,583
Operating Segments [Member]
Operating Statistics [Line Items]
Revenues	529,491	458,218	1,036,964	897,818
Affiliate revenues	3,510	2,474	6,483	4,619
Operating income (loss)	53,027	51,620	95,682	86,684
Total assets	802,591	693,350	802,591	693,350
Broadcast Solutions [Member] | Operating Segments [Member]
Operating Statistics [Line Items]
Revenues	166,551	74,335	322,137	144,392
Affiliate revenues	526	347	636	506
Operating income (loss)	3,505	2,467	3,359	3,635
Total assets	271,441	98,674	271,441	98,674
Enterprise Connectivity Solutions [Member] | Operating Segments [Member]
Operating Statistics [Line Items]
Revenues	132,929	129,475	249,556	253,827
Affiliate revenues	2,539	1,768	5,008	3,416
Operating income (loss)	14,675	14,284	23,510	24,036
Total assets	229,636	228,665	229,636	228,665
Industrial Connectivity Solutions [Member] | Operating Segments [Member]
Operating Statistics [Line Items]
Revenues	171,892	173,640	348,613	343,273
Affiliate revenues	415	303	779	601
Operating income (loss)	24,344	26,725	48,793	45,698
Total assets	241,075	239,595	241,075	239,595
Industrial IT Solutions [Member] | Operating Segments [Member]
Operating Statistics [Line Items]
Revenues	58,119	56,231	116,658	107,113
Affiliate revenues	30	56	60	96
Operating income (loss)	9,225	9,782	18,742	15,495
Total assets	60,439	54,229	60,439	54,229
All Other [Member] | Operating Segments [Member]
Operating Statistics [Line Items]
Revenues		24,537		49,213
Operating income (loss)	1,278	(1,638)	1,278	(2,180)
Total assets		$ 72,187		$ 72,187