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Revenues - Information about Operations in Different Geographic Areas (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Net sales $ 1,202,218 $ 1,287,691
United States [Member]    
Segment Reporting Information [Line Items]    
Net sales 641,234 664,146
United Kingdom [Member]    
Segment Reporting Information [Line Items]    
Net sales 47,931 [1] 49,315 [2]
European Union countries [Member]    
Segment Reporting Information [Line Items]    
Net sales 194,442 [1] 209,204 [2]
Asia [Member]    
Segment Reporting Information [Line Items]    
Net sales 208,575 [1] 240,958 [2]
Other foreign countries [Member]    
Segment Reporting Information [Line Items]    
Net sales 110,036 [1] 124,068 [2]
International [Member]    
Segment Reporting Information [Line Items]    
Net sales 560,984 [1] 623,545 [2]
Electronic Instruments Group [Member]    
Segment Reporting Information [Line Items]    
Net sales 774,225 806,911
Electronic Instruments Group [Member] | United States [Member]    
Segment Reporting Information [Line Items]    
Net sales 406,545 403,392
Electronic Instruments Group [Member] | United Kingdom [Member]    
Segment Reporting Information [Line Items]    
Net sales 14,793 [1] 15,427 [2]
Electronic Instruments Group [Member] | European Union countries [Member]    
Segment Reporting Information [Line Items]    
Net sales 105,676 [1] 102,785 [2]
Electronic Instruments Group [Member] | Asia [Member]    
Segment Reporting Information [Line Items]    
Net sales 164,745 [1] 193,847 [2]
Electronic Instruments Group [Member] | Other foreign countries [Member]    
Segment Reporting Information [Line Items]    
Net sales 82,466 [1] 91,460 [2]
Electronic Instruments Group [Member] | International [Member]    
Segment Reporting Information [Line Items]    
Net sales 367,680 [1] 403,519 [2]
Electromechanical Group [Member]    
Segment Reporting Information [Line Items]    
Net sales 427,993 480,780
Electromechanical Group [Member] | United States [Member]    
Segment Reporting Information [Line Items]    
Net sales 234,689 260,754
Electromechanical Group [Member] | United Kingdom [Member]    
Segment Reporting Information [Line Items]    
Net sales 33,138 [1] 33,888 [2]
Electromechanical Group [Member] | European Union countries [Member]    
Segment Reporting Information [Line Items]    
Net sales 88,766 [1] 106,419 [2]
Electromechanical Group [Member] | Asia [Member]    
Segment Reporting Information [Line Items]    
Net sales 43,830 [1] 47,111 [2]
Electromechanical Group [Member] | Other foreign countries [Member]    
Segment Reporting Information [Line Items]    
Net sales 27,570 [1] 32,608 [2]
Electromechanical Group [Member] | International [Member]    
Segment Reporting Information [Line Items]    
Net sales $ 193,304 [1] $ 220,026 [2]
[1] Includes U.S. export sales of $305.2 million.
[2] Includes U.S. export sales of $325.4 million.