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Segment Reporting - Summarize our Financial and Operating Data by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Operating revenue $ 1,152,265 $ 1,298,123
Operating income 78,205 115,060
Depreciation and amortization 35,449 31,289
Intermodal [Member]    
Segment Reporting Information [Line Items]    
Operating revenue 709,249 776,570
Operating income 49,379 85,696
Depreciation and amortization 27,142 24,375
Logistics [Member]    
Segment Reporting Information [Line Items]    
Operating revenue 469,141 540,984
Operating income 28,826 29,364
Depreciation and amortization 8,307 6,914
Inter-segment [Member]    
Segment Reporting Information [Line Items]    
Operating revenue $ (26,125) $ (19,431)