Business Segments (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Segment Reporting Information [Line Items]
Net sales	$ 885,175,000		$ 784,010,000		$ 1,719,227,000		$ 1,521,145,000
Percent change in Net Sales (in hundredths)	12.90%				13.00%
Gross Profit	523,182,000		445,507,000		1,012,118,000		867,083,000
Percent change in Gross Profit (in hundredths)	17.40%				16.70%
Operating profit	270,877,000	[1]	200,480,000	[1]	516,289,000		405,705,000
Percent change in Operating Profit (in hundredths)	35.10%	[1]			27.30%
Long-Lived assets	136,193,000		137,150,000		136,193,000		137,150,000
Percent change in Long-lived assets (in hundredths)					(0.70%)
Unallocated corporate general and administrative expenses	24,211	[1]	20,734	[1]	46,223	[1]	40,782	[1]
Industrial Technology [Member]
Segment Reporting Information [Line Items]
Net sales	204,814,000		197,543,000		401,815,000		379,782,000
Percent change in Net Sales (in hundredths)	3.70%				5.80%
Gross Profit	103,982,000		101,844,000		202,452,000		195,155,000
Percent change in Gross Profit (in hundredths)	2.10%				3.70%
Operating profit	60,438,000	[1]	50,580,000	[1]	116,494,000		103,525,000
Percent change in Operating Profit (in hundredths)	19.50%	[1]			12.50%
Long-Lived assets	48,848,000		46,565,000		48,848,000		46,565,000
Percent change in Long-lived assets (in hundredths)					4.90%
Energy Systems And Controls [Member]
Segment Reporting Information [Line Items]
Net sales	165,868,000		155,331,000		321,039,000		300,973,000
Percent change in Net Sales (in hundredths)	6.80%				6.70%
Gross Profit	95,857,000		87,421,000		181,822,000		168,327,000
Percent change in Gross Profit (in hundredths)	9.60%				8.00%
Operating profit	44,786,000	[1]	41,634,000	[1]	81,811,000		77,356,000
Percent change in Operating Profit (in hundredths)	7.60%	[1]			5.80%
Long-Lived assets	18,027,000		19,361,000		18,027,000		19,361,000
Percent change in Long-lived assets (in hundredths)					(6.90%)
Medical And Scientific Imaging [Member]
Segment Reporting Information [Line Items]
Net sales	268,891,000		207,957,000		525,090,000		408,401,000
Percent change in Net Sales (in hundredths)	29.30%				28.60%
Gross Profit	194,756,000		138,416,000		379,606,000		273,285,000
Percent change in Gross Profit (in hundredths)	40.70%				38.90%
Operating profit	94,381,000	[1]	47,537,000	[1]	184,152,000		107,465,000
Percent change in Operating Profit (in hundredths)	98.50%	[1]			71.40%
Long-Lived assets	39,815,000		42,926,000		39,815,000		42,926,000
Percent change in Long-lived assets (in hundredths)					(7.20%)
RF Technology [Member]
Segment Reporting Information [Line Items]
Net sales	245,602,000		223,179,000		471,283,000		431,989,000
Percent change in Net Sales (in hundredths)	10.00%				9.10%
Gross Profit	128,587,000		117,826,000		248,238,000		230,316,000
Percent change in Gross Profit (in hundredths)	9.10%				7.80%
Operating profit	71,272,000	[1]	60,729,000	[1]	133,832,000		117,359,000
Percent change in Operating Profit (in hundredths)	17.40%	[1]			14.00%
Long-Lived assets	$ 29,503,000		$ 28,298,000		$ 29,503,000		$ 28,298,000
Percent change in Long-lived assets (in hundredths)					4.30%

[1] Segment operating profit is before unallocated corporate general and administrative expenses. These expenses were $24,211 and $20,734 for the three months ended June 30, 2014 and 2013, respectively, and $46,223 and $40,782 for the six months ended June 30, 2014 and 2013, respectively.