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Revenues - Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,440,681	$ 1,126,942	$ 4,042,769	$ 3,341,082
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	1,204,548	949,839	3,410,914	2,812,108
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	236,133	177,103	631,855	528,974
Electronic Instruments Group
Disaggregation of Revenue [Line Items]
Net sales	981,815	748,372	2,706,673	2,170,479
Electronic Instruments Group | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	791,486	603,602	2,206,252	1,762,310
Electronic Instruments Group | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	190,329	144,770	500,421	408,169
Electromechanical Group
Disaggregation of Revenue [Line Items]
Net sales	458,866	378,570	1,336,096	1,170,603
Electromechanical Group | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	413,062	346,237	1,204,662	1,049,798
Electromechanical Group | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	$ 45,804	$ 32,333	$ 131,434	$ 120,805

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