Acquisition - Additional Information (Detail) $ in Thousands		3 Months Ended
	Jul. 01, 2017 USD ($)	Mar. 31, 2018 USD ($) Tractor Trailer
Hub Group Dedicated [Member]
Business Acquisition [Line Items]
Number of tractors in operating fleet | Tractor		1,300
Number of trailers in operating fleet | Trailer		4,500
Estenson Logistics, LLC [Member]
Business Acquisition [Line Items]
Business acquisition date		Jul. 01, 2017
Business acquisition, purchase price	$ 284,691
Contingent consideration related to an earn-out provision	6,000
Business acquisition, final consideration	171,729
Business acquisition, debt assumed	112,962
Business acquisition, cash paid	165,945
Amount of cash borrowed under new credit agreement	$ 55,000
Amortization expense of intangible assets		$ 1,100
Intangible assets, weighted average useful life		14 years