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Revenues - Information About Operations in Different Geographic Areas (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net sales $ 1,386,346 $ 1,011,922 $ 2,602,088 $ 2,214,140
United States        
Segment Reporting Information [Line Items]        
Net sales 720,951 528,126 1,320,034 1,169,360
United Kingdom        
Segment Reporting Information [Line Items]        
Net sales 49,217 36,179 101,215 84,110
European Union countries        
Segment Reporting Information [Line Items]        
Net sales 221,460 159,228 420,422 353,670
Asia        
Segment Reporting Information [Line Items]        
Net sales 283,303 208,726 542,058 417,301
Other foreign countries        
Segment Reporting Information [Line Items]        
Net sales 111,415 79,663 218,359 189,699
International        
Segment Reporting Information [Line Items]        
Net sales 665,395 483,796 1,282,054 1,044,780
Non-US        
Segment Reporting Information [Line Items]        
Net sales 365,500 257,900 696,400 563,100
Electronic Instruments Group        
Segment Reporting Information [Line Items]        
Net sales 933,934 647,882 1,724,858 1,422,107
Electronic Instruments Group | United States        
Segment Reporting Information [Line Items]        
Net sales 495,039 338,757 883,940 745,302
Electronic Instruments Group | United Kingdom        
Segment Reporting Information [Line Items]        
Net sales 20,649 13,427 42,596 28,220
Electronic Instruments Group | European Union countries        
Segment Reporting Information [Line Items]        
Net sales 117,856 79,901 221,521 185,577
Electronic Instruments Group | Asia        
Segment Reporting Information [Line Items]        
Net sales 217,854 161,190 415,415 325,935
Electronic Instruments Group | Other foreign countries        
Segment Reporting Information [Line Items]        
Net sales 82,536 54,607 161,386 137,073
Electronic Instruments Group | International        
Segment Reporting Information [Line Items]        
Net sales 438,895 309,125 840,918 676,805
Electromechanical Group        
Segment Reporting Information [Line Items]        
Net sales 452,412 364,040 877,230 792,033
Electromechanical Group | United States        
Segment Reporting Information [Line Items]        
Net sales 225,912 189,369 436,094 424,058
Electromechanical Group | United Kingdom        
Segment Reporting Information [Line Items]        
Net sales 28,568 22,752 58,619 55,890
Electromechanical Group | European Union countries        
Segment Reporting Information [Line Items]        
Net sales 103,604 79,327 198,901 168,093
Electromechanical Group | Asia        
Segment Reporting Information [Line Items]        
Net sales 65,449 47,536 126,643 91,366
Electromechanical Group | Other foreign countries        
Segment Reporting Information [Line Items]        
Net sales 28,879 25,056 56,973 52,626
Electromechanical Group | International        
Segment Reporting Information [Line Items]        
Net sales $ 226,500 $ 174,671 $ 441,136 $ 367,975