XML 36 R26.htm IDEA: XBRL DOCUMENT v3.8.0.1
Amortization Expense of Intangible Assets (Detail) - Hub Group Dedicated [Member]
$ in Thousands
Mar. 31, 2018
USD ($)
Finite Lived Intangible Assets [Line Items]  
Remainder 2018 $ 3,300
2019 4,400
2020 4,400
2021 4,400
2022 $ 4,400