Summary of Disaggregated Revenue by Business Line (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 4,232,383	$ 3,495,644	$ 3,668,117
Intermodal [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,391,494	2,029,186	2,083,464
Logistics [Member]
Disaggregation Of Revenue [Line Items]
Revenue	887,388	767,279	852,113
Truck brokerage [Member]
Disaggregation Of Revenue [Line Items]
Revenue	688,867	431,127	433,793
Dedicated [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 264,634	$ 268,052	$ 298,747