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Revenues - Information about Operations in Different Geographic Areas (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Net sales $ 1,011,922 $ 1,289,412 $ 2,214,140 $ 2,577,103
United States        
Segment Reporting Information [Line Items]        
Net sales 528,126 676,447 1,169,360 1,340,593
United Kingdom        
Segment Reporting Information [Line Items]        
Net sales 36,179 45,370 84,110 94,685
European Union countries        
Segment Reporting Information [Line Items]        
Net sales 159,228 204,197 353,670 413,401
Asia        
Segment Reporting Information [Line Items]        
Net sales 208,726 233,864 417,301 474,822
Other foreign countries        
Segment Reporting Information [Line Items]        
Net sales 79,663 129,534 189,699 253,602
International        
Segment Reporting Information [Line Items]        
Net sales 483,796 612,965 1,044,780 1,236,510
Non-US        
Segment Reporting Information [Line Items]        
Net sales 563,100 322,100 868,400 647,500
Electronic Instruments Group        
Segment Reporting Information [Line Items]        
Net sales 647,882 820,247 1,422,107 1,627,158
Electronic Instruments Group | United States        
Segment Reporting Information [Line Items]        
Net sales 338,757 425,543 745,302 828,935
Electronic Instruments Group | United Kingdom        
Segment Reporting Information [Line Items]        
Net sales 13,427 12,920 28,220 28,347
Electronic Instruments Group | European Union countries        
Segment Reporting Information [Line Items]        
Net sales 79,901 100,835 185,577 203,620
Electronic Instruments Group | Asia        
Segment Reporting Information [Line Items]        
Net sales 161,190 185,287 325,935 379,134
Electronic Instruments Group | Other foreign countries        
Segment Reporting Information [Line Items]        
Net sales 54,607 95,662 137,073 187,122
Electronic Instruments Group | International        
Segment Reporting Information [Line Items]        
Net sales 309,125 394,704 676,805 798,223
Electromechanical Group        
Segment Reporting Information [Line Items]        
Net sales 364,040 469,165 792,033 949,945
Electromechanical Group | United States        
Segment Reporting Information [Line Items]        
Net sales 189,369 250,904 424,058 511,658
Electromechanical Group | United Kingdom        
Segment Reporting Information [Line Items]        
Net sales 22,752 32,450 55,890 66,338
Electromechanical Group | European Union countries        
Segment Reporting Information [Line Items]        
Net sales 79,327 103,362 168,093 209,781
Electromechanical Group | Asia        
Segment Reporting Information [Line Items]        
Net sales 47,536 48,577 91,366 95,688
Electromechanical Group | Other foreign countries        
Segment Reporting Information [Line Items]        
Net sales 25,056 33,872 52,626 66,480
Electromechanical Group | International        
Segment Reporting Information [Line Items]        
Net sales $ 174,671 $ 218,261 $ 367,975 $ 438,287