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Revenues - Information About Operations in Different Geographic Areas (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,440,681	$ 1,126,942	$ 4,042,769	$ 3,341,082
United States
Segment Reporting Information [Line Items]
Net sales	739,599	578,184	2,059,633	1,747,544
United Kingdom
Segment Reporting Information [Line Items]
Net sales	58,204	40,145	159,419	124,255
European Union countries
Segment Reporting Information [Line Items]
Net sales	219,104	175,879	639,526	529,549
Asia
Segment Reporting Information [Line Items]
Net sales	307,687	235,750	849,745	653,051
Other foreign countries
Segment Reporting Information [Line Items]
Net sales	116,087	96,984	334,446	286,683
International
Segment Reporting Information [Line Items]
Net sales	701,082	548,758	1,983,136	1,593,538
Non-US
Segment Reporting Information [Line Items]
Net sales	391,000	303,200	1,087,300	866,300
Electronic Instruments Group
Segment Reporting Information [Line Items]
Net sales	981,815	748,372	2,706,673	2,170,479
Electronic Instruments Group | United States
Segment Reporting Information [Line Items]
Net sales	509,075	379,744	1,393,015	1,125,046
Electronic Instruments Group | United Kingdom
Segment Reporting Information [Line Items]
Net sales	25,358	11,488	67,954	39,708
Electronic Instruments Group | European Union countries
Segment Reporting Information [Line Items]
Net sales	117,035	97,028	338,556	282,605
Electronic Instruments Group | Asia
Segment Reporting Information [Line Items]
Net sales	242,063	188,254	657,478	514,189
Electronic Instruments Group | Other foreign countries
Segment Reporting Information [Line Items]
Net sales	88,284	71,858	249,670	208,931
Electronic Instruments Group | International
Segment Reporting Information [Line Items]
Net sales	472,740	368,628	1,313,658	1,045,433
Electromechanical Group
Segment Reporting Information [Line Items]
Net sales	458,866	378,570	1,336,096	1,170,603
Electromechanical Group | United States
Segment Reporting Information [Line Items]
Net sales	230,524	198,440	666,618	622,498
Electromechanical Group | United Kingdom
Segment Reporting Information [Line Items]
Net sales	32,846	28,657	91,465	84,547
Electromechanical Group | European Union countries
Segment Reporting Information [Line Items]
Net sales	102,069	78,851	300,970	246,944
Electromechanical Group | Asia
Segment Reporting Information [Line Items]
Net sales	65,624	47,496	192,267	138,862
Electromechanical Group | Other foreign countries
Segment Reporting Information [Line Items]
Net sales	27,803	25,126	84,776	77,752
Electromechanical Group | International
Segment Reporting Information [Line Items]
Net sales	$ 228,342	$ 180,130	$ 669,478	$ 548,105

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