Acquisitions and Investment In Other Company - Additional Information (Detail)						1 Months Ended	2 Months Ended	3 Months Ended	8 Months Ended	12 Months Ended
	Nov. 14, 2019 USD ($)	Nov. 13, 2019 USD ($)	Apr. 25, 2018 USD ($)	Apr. 25, 2018 USD ($)	Feb. 26, 2018 USD ($)	Jan. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 28, 2020 USD ($)	Jun. 03, 2019 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Business acquisiton consideration through earnouts		$ 24,000,000.0	$ 30,800,000	$ 30,800,000			$ 9,100,000	$ 9,100,000		$ 9,100,000
Goodwill							416,431,000	416,431,000	$ 381,850,000	416,431,000	$ 381,850,000			$ 252,011,000
Investment impairment								15,000,000.0		15,000,000
Industrial Automation
Business Acquisition [Line Items]
Total preliminary purchase price		81,700,000
Goodwill							396,483,000	396,483,000	363,358,000	396,483,000	363,358,000			$ 233,519,000
Estimate of Fair Value Measurement [Member]
Business Acquisition [Line Items]
Business acquisiton consideration through earnouts							39,705,000	39,705,000	70,543,000	39,705,000	70,543,000
Real War In [Member]
Business Acquisition [Line Items]
Equity Method Investments							0	0		0			$ 15,000,000.0
Subsequent Event [Member] | Real War In [Member]
Business Acquisition [Line Items]
Repayment of debt demanded												$ 25,000,000.0
Autoguide LLC [Member]
Business Acquisition [Line Items]
Total preliminary purchase price	$ 81,748,000
Arrangement range of outcomes value high		106,900,000					106,900,000	106,900,000		106,900,000
Goodwill, not deductible for tax purposes	41,400,000
Revenues							1,400,000
Business combination earnings or loss of acquiree since acquisition date							(900,000)
Goodwill	$ 41,372,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 1 month 6 days
Autoguide LLC [Member] | Industrial Automation
Business Acquisition [Line Items]
Total preliminary purchase price		81,700,000
Cash paid to acquire outstanding common and preferred stock		57,800,000
Business acquisiton consideration through earnouts		24,000,000.0
Arrangement range of outcomes value high		$ 106,900,000
Quantity of material to be transported	4,500	4,500
Business acquisition percentage of equity	100.00%	100.00%
Autoguide LLC [Member] | Estimate of Fair Value Measurement [Member]
Business Acquisition [Line Items]
Revenues										100,000	400,000
Autoguide LLC [Member] | Acquisition Related Costs
Business Acquisition [Line Items]
Net income										1,200,000	1,200,000
Mobile Industrial Robots (MiR)
Business Acquisition [Line Items]
Total preliminary purchase price			197,778,000	197,778,000
Cash paid to acquire outstanding common and preferred stock			145,200,000	145,200,000
Business acquisiton consideration through earnouts			52,600,000	52,600,000			9,100,000	9,100,000	31,000,000.0	9,100,000	31,000,000.0
Arrangement range of outcomes value high							$ 63,200,000	$ 63,200,000		63,200,000
Goodwill, not deductible for tax purposes			136,000,000.0	136,000,000.0
Revenues									24,100,000
Business combination earnings or loss of acquiree since acquisition date									$ (7,600,000)
Net income										$ 464,602,000	442,082,000
Total preliminary purchase price				197,680,000
Goodwill			$ 135,976,000	$ 135,976,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			7 years 2 months 12 days
Mobile Industrial Robots (MiR) | Estimate of Fair Value Measurement [Member]
Business Acquisition [Line Items]
Revenues											400,000
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						$ 1.4
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