CONDENSED STATEMENTS OF EARNINGS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 610,782	$ 496,850
Costs and expenses:
Costs of sales and operating expenses	450,618	363,040
Selling, general and administrative	75,765	69,629
Taxes, other than on income	9,590	8,260
Depreciation and amortization	49,964	54,890
Gain on disposition of assets	(4,849)	(2,133)
Total costs and expenses	581,088	493,686
Operating income	29,694	3,164
Other income	4,308	3,791
Interest expense	(10,203)	(10,966)
Earnings (loss) before taxes on income	23,799	(4,011)
(Provision) benefit for taxes on income	(6,213)	891
Net earnings (loss)	17,586	(3,120)
Net earnings attributable to noncontrolling interests	(152)	(255)
Net earnings (loss) attributable to Kirby	$ 17,434	$ (3,375)
Net earnings (loss) per share attributable to Kirby common stockholders:
Basic	$ 0.29	$ (0.06)
Diluted	$ 0.29	$ (0.06)
Marine Transportation [Member]
Revenues:
Total revenues	$ 355,536	$ 300,951
Distribution and Services [Member]
Revenues:
Total revenues	$ 255,246	$ 195,899