Business Segments (Details) - USD ($)		3 Months Ended				9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net sales		$ 883,933,000		$ 884,122,000		$ 2,638,755,000	$ 2,603,349,000
Percent change in Net Sales (in hundredths)		0.00%				1.40%
Gross Profit		$ 533,483,000		524,040,000		$ 1,585,555,000	1,536,158,000
Percent change in Gross Profit (in hundredths)		1.80%				3.20%
Operating profit		$ 277,601,000	[1]	271,657,000	[1]	$ 826,767,000	787,946,000
Percent change in Operating Profit (in hundredths)		2.20%	[1]			4.90%
Long-Lived assets		$ 119,473,000		138,408,000		$ 119,473,000	138,408,000
Percent change in Long-lived assets (in hundredths)						(13.70%)
Unallocated corporate general and administrative expenses	[1]	27,230		25,999		$ 77,526	72,222
Industrial Technology [Member]
Segment Reporting Information [Line Items]
Net sales		$ 186,147,000		205,688,000		$ 563,342,000	607,503,000
Percent change in Net Sales (in hundredths)		(9.50%)				(7.30%)
Gross Profit		$ 92,245,000		104,012,000		$ 281,052,000	306,464,000
Percent change in Gross Profit (in hundredths)		(11.30%)				(8.30%)
Operating profit		$ 52,298,000	[1]	62,046,000	[1]	$ 162,383,000	178,540,000
Percent change in Operating Profit (in hundredths)		(15.70%)	[1]			(9.00%)
Long-Lived assets		$ 40,170,000		47,147,000		$ 40,170,000	47,147,000
Percent change in Long-lived assets (in hundredths)						(14.80%)
Energy Systems And Controls [Member]
Segment Reporting Information [Line Items]
Net sales		$ 144,609,000		170,765,000		$ 429,762,000	491,804,000
Percent change in Net Sales (in hundredths)		(15.30%)				(12.60%)
Gross Profit		$ 84,891,000		99,233,000		$ 245,658,000	281,055,000
Percent change in Gross Profit (in hundredths)		(14.50%)				(12.60%)
Operating profit		$ 42,300,000	[1]	49,033,000	[1]	$ 110,424,000	130,844,000
Percent change in Operating Profit (in hundredths)		(13.70%)	[1]			(15.60%)
Long-Lived assets		$ 13,915,000		17,537,000		$ 13,915,000	17,537,000
Percent change in Long-lived assets (in hundredths)						(20.70%)
Medical And Scientific Imaging [Member]
Segment Reporting Information [Line Items]
Net sales		$ 299,621,000		268,809,000		$ 893,583,000	793,899,000
Percent change in Net Sales (in hundredths)		11.50%				12.60%
Gross Profit		$ 222,655,000		193,132,000		$ 660,971,000	572,738,000
Percent change in Gross Profit (in hundredths)		15.30%				15.40%
Operating profit		$ 108,399,000	[1]	91,227,000	[1]	$ 325,439,000	275,379,000
Percent change in Operating Profit (in hundredths)		18.80%	[1]			18.20%
Long-Lived assets		$ 35,818,000		44,513,000		$ 35,818,000	44,513,000
Percent change in Long-lived assets (in hundredths)						(19.50%)
RF Technology [Member]
Segment Reporting Information [Line Items]
Net sales		$ 253,556,000		238,860,000		$ 752,068,000	710,143,000
Percent change in Net Sales (in hundredths)		6.20%				5.90%
Gross Profit		$ 133,692,000		127,663,000		$ 397,874,000	375,901,000
Percent change in Gross Profit (in hundredths)		4.70%				5.80%
Operating profit		$ 74,604,000	[1]	69,351,000	[1]	$ 228,521,000	203,183,000
Percent change in Operating Profit (in hundredths)		7.60%	[1]			12.50%
Long-Lived assets		$ 29,570,000		$ 29,211,000		$ 29,570,000	$ 29,211,000
Percent change in Long-lived assets (in hundredths)						1.20%

[1] Segment operating profit is before unallocated corporate general and administrative expenses. These expenses were $27,230 and $25,999 for the three months ended September 30, 2015 and 2014, respectively, and $77,526 and $72,222 for the nine months ended September 30, 2015 and 2014, respectively.