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Revenues - Information about Operations in Different Geographic Areas (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Net sales $ 1,215,742 $ 1,202,218
United States    
Segment Reporting Information [Line Items]    
Net sales 599,083 641,234
United Kingdom    
Segment Reporting Information [Line Items]    
Net sales 51,998 47,931
European Union countries    
Segment Reporting Information [Line Items]    
Net sales 198,962 194,442
Asia    
Segment Reporting Information [Line Items]    
Net sales 258,755 208,575
Other foreign countries    
Segment Reporting Information [Line Items]    
Net sales 106,944 110,036
International    
Segment Reporting Information [Line Items]    
Net sales 616,659 560,984
Non-US    
Segment Reporting Information [Line Items]    
Net sales 331,200 305,200
Electronic Instruments Group    
Segment Reporting Information [Line Items]    
Net sales 790,924 774,225
Electronic Instruments Group | United States    
Segment Reporting Information [Line Items]    
Net sales 388,901 406,545
Electronic Instruments Group | United Kingdom    
Segment Reporting Information [Line Items]    
Net sales 21,947 14,793
Electronic Instruments Group | European Union countries    
Segment Reporting Information [Line Items]    
Net sales 103,665 105,676
Electronic Instruments Group | Asia    
Segment Reporting Information [Line Items]    
Net sales 197,561 164,745
Electronic Instruments Group | Other foreign countries    
Segment Reporting Information [Line Items]    
Net sales 78,850 82,466
Electronic Instruments Group | International    
Segment Reporting Information [Line Items]    
Net sales 402,023 367,680
Electromechanical Group    
Segment Reporting Information [Line Items]    
Net sales 424,818 427,993
Electromechanical Group | United States    
Segment Reporting Information [Line Items]    
Net sales 210,182 234,689
Electromechanical Group | United Kingdom    
Segment Reporting Information [Line Items]    
Net sales 30,051 33,138
Electromechanical Group | European Union countries    
Segment Reporting Information [Line Items]    
Net sales 95,297 88,766
Electromechanical Group | Asia    
Segment Reporting Information [Line Items]    
Net sales 61,194 43,830
Electromechanical Group | Other foreign countries    
Segment Reporting Information [Line Items]    
Net sales 28,094 27,570
Electromechanical Group | International    
Segment Reporting Information [Line Items]    
Net sales $ 214,636 $ 193,304