CONDENSED STATEMENTS OF EARNINGS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues:
Revenues	$ 808,022	$ 750,444
Costs and expenses:
Costs of sales and operating expenses	550,681	542,080
Selling, general and administrative	90,206	88,849
Taxes, other than on income	8,044	9,186
Depreciation and amortization	57,642	51,109
Gain on disposition of assets	(74)	(2,230)
Total costs and expenses	706,499	688,994
Operating income	101,523	61,450
Other income	3,269	6,443
Interest expense	(13,151)	(13,221)
Earnings before taxes on income	91,641	54,672
Provision for taxes on income	(21,726)	(14,051)
Net earnings	69,915	40,621
Net loss attributable to noncontrolling interests	153	77
Net earnings attributable to Kirby	$ 70,068	$ 40,698
Net earnings per share attributable to Kirby common stockholders:
Basic	$ 1.2	$ 0.68
Diluted	$ 1.19	$ 0.68
Marine Transportation [Member]
Revenues:
Revenues	$ 475,412	$ 412,495
Distribution and Services [Member]
Revenues:
Revenues	$ 332,610	$ 337,949