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Summary of Disaggregated Revenue by Business Line (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,018,293	$ 933,224	$ 894,734	$ 837,342	$ 909,239	$ 824,809	$ 708,572	$ 680,443	$ 3,683,593	$ 3,123,063	$ 2,750,449
Intermodal [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,195,316	1,870,873	1,803,974
Truck brokerage [Member]
Disaggregation Of Revenue [Line Items]
Revenue									497,282	481,635	389,700
Logistics [Member]
Disaggregation Of Revenue [Line Items]
Revenue									698,138	655,543	$ 556,775
Dedicated [Member]
Disaggregation Of Revenue [Line Items]
Revenue									$ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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