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Revenues - Major Products and Services in Reportable Segments (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
Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	557,570	586,430	1,589,550	1,747,708
Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	306,928	352,350	928,439	1,057,500
Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	262,444	337,853	823,093	1,048,528
Electronic Instruments Group
Disaggregation of Revenue [Line Items]
Net sales	748,372	815,552	2,170,479	2,442,710
Electronic Instruments Group | Process and analytical instrumentation
Disaggregation of Revenue [Line Items]
Net sales	557,570	586,430	1,589,550	1,747,708
Electronic Instruments Group | Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	190,802	229,122	580,929	695,002
Electromechanical Group
Disaggregation of Revenue [Line Items]
Net sales	378,570	461,081	1,170,603	1,411,026
Electromechanical Group | Aerospace and power
Disaggregation of Revenue [Line Items]
Net sales	116,126	123,228	347,510	362,498
Electromechanical Group | Automation and engineered solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 262,444	$ 337,853	$ 823,093	$ 1,048,528

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Amount, including 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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