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Summary of Disaggregated Revenue by Business Line (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 900,681	$ 913,275	$ 921,163	$ 932,998	$ 1,018,293	$ 933,224	$ 894,734	$ 837,342	$ 3,668,117	$ 3,683,593	$ 3,123,063
Intermodal [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,166,382	2,219,739	1,891,499
Truck brokerage [Member]
Disaggregation Of Revenue [Line Items]
Revenue									433,793	497,282	481,635
Logistics [Member]
Disaggregation Of Revenue [Line Items]
Revenue									769,195	673,715	634,917
Dedicated [Member]
Disaggregation Of Revenue [Line Items]
Revenue									$ 298,747	$ 292,857	$ 115,012

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+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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