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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 16, 2024
Jun. 30, 2023
Cover [Abstract]      
Entity Registrant Name Kirby Corporation    
Entity Central Index Key 0000056047    
Current Fiscal Year End Date --12-31    
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Document Transition Report false    
Securities Act File Number 1-07615    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 74-1884980    
Entity Address, Address Line One 55 Waugh Drive    
Entity Address, Address Line Two Suite 1000    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77007    
City Area Code 713    
Local Phone Number 435-1000    
Title of 12(b) Security Common Stock    
Trading Symbol KEX    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
ICFR Auditor Attestation Flag true    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 4.5
Entity Common Stock, Shares Outstanding   58,522,000  
Documents Incorporated by Reference [Text Block]

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Company’s definitive proxy statement in connection with the Annual Meeting of Stockholders to be held April 26, 2024, to be filed with the Commission pursuant to Regulation 14A, and the related annual report for the fiscal year ended December 31, 2023, to be provided to the Company's stockholders pursuant to Rule 14a-3(b) are incorporated by reference into Parts II and III of this report.

    
Auditor Name KPMG LLP    
Auditor Location Houston, TX    
Auditor Firm ID 185    
Document Financial Statement Error Correction [Flag] false