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Unaudited Pro forma Consolidated Results of Operations (Detail) - CaseStack, Inc. and Hub Group Dedicated [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Revenue | $ 3,912,745 | $ 3,449,373 | $ 2,965,032
Income from continuing operations | $ 133,310 | $ 122,532 | $ 64,825
Earnings per share |  |  |
Basic | $ 2.81 | $ 3.69 | $ 1.91
Diluted | $ 2.79 | $ 3.67 | $ 1.90

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