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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Business Acquisition [Line Items]      
Revenue $ 507,982 $ 1,588,042 $ 1,666,075
Net income $ 100,339 $ 306,768 $ 351,626
Net income per common share, basic $ 0.51 $ 1.61 $ 1.77
Net income per common share, diluted $ 0.50 $ 1.56 $ 1.75