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Summary of Disaggregated Revenue by Business Line (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
[1]
Jun. 30, 2020
[2]
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]                      
Revenue $ 952,730 $ 924,812 $ 779,243 $ 838,859 $ 900,681 $ 913,275 $ 921,163 $ 932,998 $ 3,495,644 $ 3,668,117 $ 3,683,593
Intermodal [Member]                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 2,091,984 2,166,382 2,219,739
Logistics [Member]                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 704,824 769,195 673,715
Truck brokerage [Member]                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 431,127 433,793 497,282
Dedicated [Member]                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 $ 267,709 $ 298,747 $ 292,857
[1]

We donated an additional $0.2 million of refrigerated trailers during the third quarter of 2020.

[2]

We donated refrigerated trailers with a carrying value of approximately $5.4 million during the second quarter of 2020 to be used by emergency responders in fighting the COVID-19 pandemic.