Components of Intangible Assets and Their Estimated Useful Lives at Acquisition Date (Detail) - USD ($) $ in Thousands			12 Months Ended
	Nov. 14, 2019	Apr. 25, 2018	Dec. 31, 2019
Autoguide LLC [Member]
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 37,660
Total intangible assets, estimated useful life, years	6 years 1 month 6 days
Mobile Industrial Robots (MiR)
Business Acquisition [Line Items]
Total intangible assets, fair value		$ 80,670	$ 37,700
Total intangible assets, estimated useful life, years		7 years 2 months 12 days
Developed technology | Autoguide LLC [Member]
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 24,590
Total intangible assets, estimated useful life, years	6 years
Developed technology | Mobile Industrial Robots (MiR)
Business Acquisition [Line Items]
Total intangible assets, fair value		$ 58,900
Total intangible assets, estimated useful life, years		7 years
Trademarks and tradenames | Autoguide LLC [Member]
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 7,360
Total intangible assets, estimated useful life, years	6 years
Trademarks and tradenames | Mobile Industrial Robots (MiR)
Business Acquisition [Line Items]
Total intangible assets, fair value		$ 13,240
Total intangible assets, estimated useful life, years		11 years
Customer Relationships | Autoguide LLC [Member]
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 5,450
Total intangible assets, estimated useful life, years	7 years
Customer Relationships | Mobile Industrial Robots (MiR)
Business Acquisition [Line Items]
Total intangible assets, fair value		$ 8,500
Total intangible assets, estimated useful life, years		2 years 6 months
Customer backlog | Autoguide LLC [Member]
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 260
Total intangible assets, estimated useful life, years	3 months 18 days
Customer backlog | Mobile Industrial Robots (MiR)
Business Acquisition [Line Items]
Total intangible assets, fair value		$ 30
Total intangible assets, estimated useful life, years		2 months 12 days