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Revenues - Major Products and Services in Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,215,742	$ 1,202,218
Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	576,559	548,440
Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	336,538	353,036
Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	302,645	300,742
Electronic Instruments Group
Disaggregation of Revenue [Line Items]
Net sales	790,924	774,225
Electronic Instruments Group | Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	576,559	548,440
Electronic Instruments Group | Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	214,365	225,785
Electronic Instruments Group | Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	0	0
Electromechanical Group
Disaggregation of Revenue [Line Items]
Net sales	424,818	427,993
Electromechanical Group | Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	0	0
Electromechanical Group | Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	122,173	127,251
Electromechanical Group | Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 302,645	$ 300,742

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