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Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information [Line Items]
Contingent consideration fair value adjustment									$ (23,271)	$ (19,257)	$ 987
Impairment of fixed assets and other expenses			$ 800
Severance benefit and charges	$ 1,100	$ 1,100		$ 700	$ 500	$ 800	$ 800	$ 800
Acquisition related expense and compensation		500	3,100	1,400	200	500	500	1,300
Pension and post retirement net actuarial (gains) losses	7,700	2,700	100		7,700					(29,000)
Investment impairment					15,000					15,000
Universal Robots (UR)
Quarterly Financial Information [Line Items]
Contingent consideration fair value adjustment		$ 27,200	29,900	$ 10,000		$ 7,800	$ 11,700	$ 3,000		3,800
Mobile Industrial Robots (MiR)
Quarterly Financial Information [Line Items]
Contingent consideration fair value adjustment					5,800
Autoguide LLC
Quarterly Financial Information [Line Items]
Contingent consideration fair value adjustment	15,300		600		$ 3,000					$ 3,000
Acquisition related expense and compensation	$ 900
Contract termination settlement fee			$ 4,000

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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