Acquisitions and Investment In Other Company - Additional Information (Detail) - USD ($)			1 Months Ended	9 Months Ended
	Apr. 25, 2018	Feb. 26, 2018	Jan. 30, 2019	Sep. 30, 2018	Sep. 29, 2019	Jun. 03, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Contingent consideration							$ 30,800,000
Goodwill					$ 370,717,000		381,850,000
Estimate of Fair Value Measurement [Member]
Business Acquisition [Line Items]
Contingent consideration					18,080,000		$ 70,543,000
Revenues				$ 400,000
Real War In [Member]
Business Acquisition [Line Items]
Equity Method Investments						$ 15,000,000.0
Investments, Fair Value Disclosure					15,000,000.0
Mobile Industrial Robots (MiR)
Business Acquisition [Line Items]
Total preliminary purchase price	$ 197,778,000
Cash paid to acquire outstanding common and preferred stock	145,200,000
Contingent consideration	52,600,000
Arrangement range of outcomes value high					$ 81,000,000.0
Goodwill, not deductible for tax purposes	136,000,000.0
Net income				306,768,000
Goodwill	$ 135,976,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years 2 months 12 days
Mobile Industrial Robots (MiR) | Acquisition Related Costs
Business Acquisition [Line Items]
Net income				$ 2,900,000
Energid Technologies Corporation
Business Acquisition [Line Items]
Total preliminary purchase price		$ 27,600,000
Goodwill		14,400,000
Acquired value of intangible assets		$ 12,300,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		7 years 8 months 12 days
Net tangible assets		$ 1,000,000.0
Lemsys [Member]
Business Acquisition [Line Items]
Total preliminary purchase price			$ 1,400,000
Total preliminary purchase price			9,100,000
Acquired value of intangible assets			$ 4,600,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years 2 months 12 days
Net tangible assets			$ 3,100,000