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Revenues - Timing of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 1,126,942	$ 1,276,633	$ 3,341,082	$ 3,853,736
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	949,839	1,069,230	2,812,108	3,270,998
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	177,103	207,403	528,974	582,738
Electronic Instruments Group
Disaggregation of Revenue [Line Items]
Net sales	748,372	815,552	2,170,479	2,442,710
Electronic Instruments Group | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	603,602	652,950	1,762,310	1,984,938
Electronic Instruments Group | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	144,770	162,602	408,169	457,772
Electromechanical Group
Disaggregation of Revenue [Line Items]
Net sales	378,570	461,081	1,170,603	1,411,026
Electromechanical Group | Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales	346,237	416,280	1,049,798	1,286,060
Electromechanical Group | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales	$ 32,333	$ 44,801	$ 120,805	$ 124,966

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