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Amortization Expense of Intangible Assets (Detail) - Hub Group Dedicated [Member]
$ in Thousands
Sep. 30, 2017
USD ($)
Finite Lived Intangible Assets [Line Items]  
Remainder 2017 $ 1,100
2018 4,400
2019 4,400
2020 4,400
2021 $ 4,400