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Summary of Disaggregated Revenue by Business Line (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 924,812	$ 913,275	$ 2,542,914	$ 2,767,436
Intermodal [Member]
Disaggregation Of Revenue [Line Items]
Revenue	559,759	539,484	1,515,759	1,618,407
Logistics [Member]
Disaggregation Of Revenue [Line Items]
Revenue	175,892	189,470	522,890	586,196
Truck brokerage [Member]
Disaggregation Of Revenue [Line Items]
Revenue	119,994	109,543	304,686	334,211
Dedicated [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 69,167	$ 74,778	$ 199,579	$ 228,622

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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