Segment Reporting - Summary of Company's Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 375,485	$ 374,292	$ 1,136,067	$ 1,075,330
Income from operations	(7,353)	22,530	49,876	65,886
Total assets	934,729	768,960	934,729	768,960	$ 843,147
Operating Segments [Member] | Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	254,129	248,529	752,610	688,794
Income from operations	(17,224)	11,885	8,601	32,273
Total assets	572,238	456,638	572,238	456,638
Operating Segments [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenues	120,981	125,385	382,541	385,431
Income from operations	9,796	10,503	40,955	32,950
Total assets	332,904	292,054	332,904	292,054
Other [Member]
Segment Reporting Information [Line Items]
Revenues	375	378	916	1,105
Income from operations	75	142	320	663
Total assets	29,587	20,268	29,587	20,268
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(409)	(3,594)	(1,959)	(10,271)
Intersegment Eliminations [Member] | Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	(283)	(406)	(1,208)	(1,336)
Intersegment Eliminations [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenues	$ (126)	$ (3,188)	$ (751)	$ (8,935)