Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 855,455	$ 824,390	$ 1,641,114	$ 1,632,412
Revenue recognized			94,700	81,500
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	492,562	484,808	968,711	960,220
Marine Transportation [Member] \| Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	397,141	391,835	789,640	777,842
Marine Transportation [Member] \| Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	95,421	92,973	179,071	182,378
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	362,893	339,582	672,403	672,192
Distribution and Services [Member] \| Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	173,606	165,658	333,834	308,282
Distribution and Services [Member] \| Power generation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	140,739	107,783	245,241	243,452
Distribution and Services [Member] \| Oil and gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 48,548	$ 66,141	$ 93,328	$ 120,458

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.

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