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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Revenue	$ 565,978	$ 1,061,577
Net income	$ 95,948	$ 203,237
Net income per common share, basic	$ 0.56	$ 1.18
Net income per common share, diluted	$ 0.54	$ 1.14

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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