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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
--- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 528,238 | $ 699,790 | $ 1,021,194 | $ 1,158,228
Net income | $ 101,780 | $ 172,238 | $ 186,787 | $ 251,728
Net income per common share, basic | $ 0.53 | $ 0.87 | $ 0.97 | $ 1.26
Net income per common share, diluted | $ 0.52 | $ 0.85 | $ 0.94 | $ 1.25

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