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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenue | $ $ 1,588,042
Net income | $ $ 306,768
Net income per common share, basic | $ / shares $ 1.61
Net income per common share, diluted | $ / shares $ 1.56