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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenues | $ $ 495,599
Net income | $ $ 107,289
Net income per common share, basic | $ / shares $ 0.62
Net income per common share, diluted | $ / shares $ 0.61