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Restructuring and Other - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Mar. 31, 2021	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
Restructuring Cost and Reserve
Contingent consideration adjustment										$ (23,271)	$ (19,257)	$ 987
Severance benefit and charges		$ 1,100	$ 1,100		$ 700	$ 500	$ 800	$ 800	$ 800
Acquisition related costs			500	$ 3,100	1,400	200	500	500	1,300
Semiconductor Test
Restructuring Cost and Reserve
Contingent consideration adjustment										3,500
Severance benefit and charges	$ 500									2,300
Acquisition related costs										2,500	2,500
Contract termination settlement fee										4,000
AutoGuide
Restructuring Cost and Reserve
Contingent consideration adjustment											3,000
Universal Robots (UR)
Restructuring Cost and Reserve
Contingent consideration adjustment			$ 27,200	$ 29,900	$ 10,000		$ 7,800	$ 11,700	$ 3,000		3,800
Mobile Industrial Robots (MiR)
Restructuring Cost and Reserve
Contingent consideration adjustment						$ 5,800
Semiconductor Test, Industrial Automation and Corporate
Restructuring Cost and Reserve
Severance benefit and charges											2,900
Restructuring and other										1,200
Semiconductor Test, Industrial Automation and Corporate | Mobile Industrial Robots (MiR)
Restructuring Cost and Reserve
Contingent consideration adjustment											$ 22,200
TER Corporate And Eliminations | Universal Robots (UR)
Restructuring Cost and Reserve
Contingent consideration adjustment										$ 19,700

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