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Revenues - Major Products and Services in Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,386,346	$ 1,011,922	$ 2,602,088	$ 2,214,140
Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	644,121	483,540	1,220,680	1,031,980
Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	416,279	268,475	752,817	621,511
Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	325,946	259,907	628,591	560,649
Electronic Instruments Group
Disaggregation of Revenue [Line Items]
Net sales	933,934	647,882	1,724,858	1,422,107
Electronic Instruments Group | Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	644,121	483,540	1,220,680	1,031,980
Electronic Instruments Group | Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	289,813	164,342	504,178	390,127
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	452,412	364,040	877,230	792,033
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	126,466	104,133	248,639	231,384
Electromechanical Group | Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 325,946	$ 259,907	$ 628,591	$ 560,649

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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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