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Revenues - Major Products and Services in Reportable Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 1,011,922 $ 1,289,412 $ 2,214,140 $ 2,577,103
Process and analytical instrumentation        
Disaggregation of Revenue [Line Items]        
Net sales 483,540 583,938 1,031,980 1,161,278
Aerospace and power        
Disaggregation of Revenue [Line Items]        
Net sales 268,475 356,701 621,511 705,150
Automation and engineered solutions        
Disaggregation of Revenue [Line Items]        
Net sales 259,907 348,773 560,649 710,675
Electronic Instruments Group        
Disaggregation of Revenue [Line Items]        
Net sales 647,882 820,247 1,422,107 1,627,158
Electronic Instruments Group | Process and analytical instrumentation        
Disaggregation of Revenue [Line Items]        
Net sales 483,540 583,938 1,031,980 1,161,278
Electronic Instruments Group | Aerospace and power        
Disaggregation of Revenue [Line Items]        
Net sales 164,342 236,309 390,127 465,880
Electromechanical Group        
Disaggregation of Revenue [Line Items]        
Net sales 364,040 469,165 792,033 949,945
Electromechanical Group | Aerospace and power        
Disaggregation of Revenue [Line Items]        
Net sales 104,133 120,392 231,384 239,270
Electromechanical Group | Automation and engineered solutions        
Disaggregation of Revenue [Line Items]        
Net sales $ 259,907 $ 348,773 $ 560,649 $ 710,675