Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 813,841	$ 644,231
Equipment, capital lease obligation				$ 26,400
Equipment, capital lease obligation, net	10,000	12,300
Depreciation and amortization expense related to property and equipment	58,100	43,400	$ 35,900
Amortization expense under capital lease obligation	2,200	2,300	$ 2,600
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	620,951	472,634
Transportation Equipment [Member] | Hub Group Dedicated [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	621,000	472,600
Computer Software and Hardware [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 109,336	$ 91,302