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Revenues - Major Products and Services in Reportable Segments (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
Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	661,243	557,570	1,881,923	1,589,550
Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	451,243	306,928	1,204,060	928,439
Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	328,195	262,444	956,786	823,093
Electronic Instruments Group
Disaggregation of Revenue [Line Items]
Net sales	981,815	748,372	2,706,673	2,170,479
Electronic Instruments Group | Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	661,243	557,570	1,881,923	1,589,550
Electronic Instruments Group | Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	320,572	190,802	824,750	580,929
Electronic Instruments Group | Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Electromechanical Group
Disaggregation of Revenue [Line Items]
Net sales	458,866	378,570	1,336,096	1,170,603
Electromechanical Group | Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Electromechanical Group | Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	130,671	116,126	379,310	347,510
Electromechanical Group | Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 328,195	$ 262,444	$ 956,786	$ 823,093

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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