CONDENSED STATEMENTS OF EARNINGS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues:
Revenues	$ 750,444	$ 610,782
Costs and expenses:
Costs of sales and operating expenses	542,080	450,618
Selling, general and administrative	88,849	75,765
Taxes, other than on income	9,186	9,590
Depreciation and amortization	51,109	49,964
Gain on disposition of assets	(2,230)	(4,849)
Total costs and expenses	688,994	581,088
Operating income	61,450	29,694
Other income	6,443	4,308
Interest expense	(13,221)	(10,203)
Earnings before taxes on income	54,672	23,799
Provision for taxes on income	(14,051)	(6,213)
Net earnings	40,621	17,586
Net (earnings) loss attributable to noncontrolling interests	77	(152)
Net earnings attributable to Kirby	$ 40,698	$ 17,434
Net earnings loss per share attributable to Kirby common stockholders:
Basic	$ 0.68	$ 0.29
Diluted	$ 0.68	$ 0.29
Marine Transportation [Member]
Revenues:
Revenues	$ 412,495	$ 355,536
Distribution and Services [Member]
Revenues:
Revenues	$ 337,949	$ 255,246