Operating Segments - Operating Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 610,774	$ 522,478	$ 1,699,355	$ 1,559,442
Operating income (loss)	58,011	53,935	119,848	152,088
Total assets	3,007,986		3,007,986		2,751,753
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Revenues	610,774	522,478	1,699,355	1,559,442
Affiliate revenues	2,872	2,751	8,708	9,234
Operating income (loss)	57,963	53,644	119,368	149,326
Total assets	991,624	855,021	991,624	855,021
Reportable Segment [Member] | Broadcast Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	254,230	176,062	668,213	498,199
Affiliate revenues	318	118	601	754
Operating income (loss)	13,423	7,541	(2,311)	10,900
Total assets	433,063	294,268	433,063	294,268
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	115,349	123,406	345,015	372,962
Affiliate revenues	2,147	1,930	5,852	6,938
Operating income (loss)	14,208	13,984	38,109	37,494
Total assets	223,726	234,957	223,726	234,957
Reportable Segment [Member] | Industrial Connectivity Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	171,105	167,008	508,667	515,621
Affiliate revenues	397	475	2,237	1,254
Operating income (loss)	20,965	22,926	60,054	71,719
Total assets	270,078	268,551	270,078	268,551
Reportable Segment [Member] | Industrial IT Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	70,090	56,002	177,460	172,660
Affiliate revenues	10	228	18	288
Operating income (loss)	9,367	9,193	23,516	27,935
Total assets	64,757	57,245	64,757	57,245
Reportable Segment [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Operating income (loss)				$ 1,278