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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Revenue | $ 996,848 | $ 2,850,047
Income from continuing operations | $ 27,788 | $ 59,874
Earnings per share |  |
Basic | $ 0.83 | $ 1.79
Diluted | $ 0.83 | $ 1.78

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