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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Revenues	$ 2,107,600	$ 2,148,320
Net income	$ 450,559	$ 243,399
Net income per common share, basic	$ 2.40	$ 1.23
Net income per common share, diluted	$ 2.34	$ 1.21

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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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