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Revenue from Contracts with Customers - Summary of Disaggregated Revenue by Business Line (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer Excluding Assessed Tax $ 919,553 $ 838,859
Intermodal [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer Excluding Assessed Tax 506,004 478,034
Logistics [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer Excluding Assessed Tax 217,035 200,202
Truck Brokerage [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer Excluding Assessed Tax 127,262 98,017
Dedicated Carrier [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer Excluding Assessed Tax $ 69,252 $ 62,606