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Segment Reporting - Summary of Financial and Operating Data by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Operating revenue $ 999,493 $ 1,152,265
Operating income 37,139 78,205
Depreciation and amortization 38,331 35,449
Intermodal [Member]    
Segment Reporting Information [Line Items]    
Operating revenue 552,033 709,249
Operating income 13,031 49,379
Depreciation and amortization 27,049 27,142
Logistics [Member]    
Segment Reporting Information [Line Items]    
Operating revenue 480,224 469,141
Operating income 24,108 28,826
Depreciation and amortization 11,282 8,307
Inter-segment [Member]    
Segment Reporting Information [Line Items]    
Operating revenue $ (32,764) $ (26,125)