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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
Business Acquisition [Line Items]
Revenue	$ 3,912,745	$ 3,449,373
Income from continuing operations	$ 133,310	$ 122,532
Earnings per share
Basic	$ 2.81	$ 3.69
Diluted	$ 2.79	$ 3.67

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Business acquisition, pro forma earnings per share, basic and diluted.

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Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

+ References

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-Publisher FASB
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Per diluted share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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