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Revenues (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 598,920,000	$ 496,567,000	$ 1,655,394,000	$ 1,681,652,000
Revenue recognized			40,315,000	37,153,000
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	338,514,000	320,602,000	972,352,000	1,104,846,000
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	255,791,000	247,647,000	733,830,000	869,224,000
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	82,723,000	72,955,000	238,522,000	235,622,000
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	260,406,000	175,965,000	683,042,000	576,806,000
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	153,056,000	127,224,000	426,930,000	418,763,000
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 107,350,000	$ 48,741,000	$ 256,112,000	$ 158,043,000

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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