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Revenues - Information about Operations in Different Geographic Areas (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 1,126,942	$ 1,276,633	$ 3,341,082	$ 3,853,736
United States
Segment Reporting Information [Line Items]
Net sales	578,184	673,972	1,747,544	2,014,565
United Kingdom
Segment Reporting Information [Line Items]
Net sales	40,145	53,857	124,255	148,542
European Union countries
Segment Reporting Information [Line Items]
Net sales	175,879	197,537	529,549	610,938
Asia
Segment Reporting Information [Line Items]
Net sales	235,750	236,766	653,051	711,588
Other foreign countries
Segment Reporting Information [Line Items]
Net sales	96,984	114,501	286,683	368,103
International
Segment Reporting Information [Line Items]
Net sales	548,758	602,661	1,593,538	1,839,171
Non-US
Segment Reporting Information [Line Items]
Net sales	303,200	317,600	866,300	965,100
Electronic Instruments Group
Segment Reporting Information [Line Items]
Net sales	748,372	815,552	2,170,479	2,442,710
Electronic Instruments Group | United States
Segment Reporting Information [Line Items]
Net sales	379,744	421,629	1,125,046	1,250,564
Electronic Instruments Group | United Kingdom
Segment Reporting Information [Line Items]
Net sales	11,488	19,538	39,708	47,885
Electronic Instruments Group | European Union countries
Segment Reporting Information [Line Items]
Net sales	97,028	99,180	282,605	302,800
Electronic Instruments Group | Asia
Segment Reporting Information [Line Items]
Net sales	188,254	190,419	514,189	569,553
Electronic Instruments Group | Other foreign countries
Segment Reporting Information [Line Items]
Net sales	71,858	84,786	208,931	271,908
Electronic Instruments Group | International
Segment Reporting Information [Line Items]
Net sales	368,628	393,923	1,045,433	1,192,146
Electromechanical Group
Segment Reporting Information [Line Items]
Net sales	378,570	461,081	1,170,603	1,411,026
Electromechanical Group | United States
Segment Reporting Information [Line Items]
Net sales	198,440	252,343	622,498	764,001
Electromechanical Group | United Kingdom
Segment Reporting Information [Line Items]
Net sales	28,657	34,319	84,547	100,657
Electromechanical Group | European Union countries
Segment Reporting Information [Line Items]
Net sales	78,851	98,357	246,944	308,138
Electromechanical Group | Asia
Segment Reporting Information [Line Items]
Net sales	47,496	46,347	138,862	142,035
Electromechanical Group | Other foreign countries
Segment Reporting Information [Line Items]
Net sales	25,126	29,715	77,752	96,195
Electromechanical Group | International
Segment Reporting Information [Line Items]
Net sales	$ 180,130	$ 208,738	$ 548,105	$ 647,025

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