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Pro Forma Results Under Acquisition (Detail) - Mobile Industrial Robots (MiR) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Revenue | $ 2,303,737 | $ 2,111,373
Net income | $ 464,602 | $ 442,082
Net income per common share, basic | $ 2.73 | $ 2.36
Net income per common share, diluted | $ 2.59 | $ 2.30

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