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Summary of Significant Accounting Policies, Accounting Standards (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements [Abstract]                      
Operating lease right-of-use assets $ 159,641,000       $ 0       $ 159,641,000 $ 0  
Liabilities for operating leases 209,866,000               209,866,000    
Statements of earnings [Abstract]                      
Revenues                 2,838,399,000 2,970,697,000 $ 2,214,418,000
Costs of sales and operating expenses                 2,030,046,000 2,160,946,000 1,558,098,000
Operating income 16,177,000 $ 77,901,000 $ 75,843,000 $ 72,106,000 (19,241,000) $ 67,957,000 $ 55,853,000 $ 50,720,000 242,027,000 155,289,000 93,625,000
Earnings before taxes on income 4,319,000 64,455,000 62,709,000 58,337,000 (30,292,000) 57,066,000 44,854,000 42,531,000 189,820,000 114,159,000 73,014,000
Provision for taxes on income (1,347,000) (16,305,000) (15,269,000) (13,880,000) 5,961,000 (15,116,000) (16,061,000) (9,865,000) (46,801,000) (35,081,000) 240,889,000
Net earnings attributable to Kirby 2,777,000 47,987,000 47,287,000 44,296,000 (24,437,000) 41,816,000 28,602,000 32,471,000 142,347,000 78,452,000 313,187,000
Statements of comprehensive income [Abstract]                      
Net earnings 2,972,000 48,150,000 47,440,000 44,457,000 (24,331,000) 41,950,000 28,793,000 32,666,000 143,019,000 79,078,000 313,903,000
Comprehensive income attributable to Kirby                 138,059,000 77,346,000 331,789,000
Statements of cash flows [Abstract]                      
Net earnings 2,972,000 $ 48,150,000 $ 47,440,000 $ 44,457,000 (24,331,000) $ 41,950,000 $ 28,793,000 $ 32,666,000 143,019,000 79,078,000 313,903,000
Provision for deferred income taxes                 46,839,000 34,881,000 (256,263,000)
Decrease in cash flows resulting from changes in: [Abstract]                      
Accounts receivable                 43,078,000 12,511,000 (60,405,000)
Inventory                 122,773,000 (144,685,000) 19,673,000
Accrued and other liabilities                 (43,907,000) 30,712,000 (3,105,000)
Distribution and Services [Member]                      
Statements of earnings [Abstract]                      
Revenues                 1,251,317,000 1,487,554,000 890,312,000
ASU 2016-02 [Member]                      
New Accounting Pronouncements [Abstract]                      
Operating lease right-of-use assets 168,149,000               168,149,000    
Liabilities for operating leases $ 175,778,000               $ 175,778,000    
ASC 606 [Member]                      
New Accounting Pronouncements [Abstract]                      
Cumulative effect on retained earnings                     (9,722,000)
ASC 606 [Member] | Retained Earnings [Member]                      
New Accounting Pronouncements [Abstract]                      
Cumulative effect on retained earnings         $ (9,722,000)         (9,722,000) $ (9,722,000)
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member]                      
Statements of earnings [Abstract]                      
Costs of sales and operating expenses                   2,181,046,000  
Operating income                   163,189,000  
Earnings before taxes on income                   122,059,000  
Provision for taxes on income                   (37,187,000)  
Net earnings attributable to Kirby                   84,246,000  
Statements of comprehensive income [Abstract]                      
Net earnings                   84,872,000  
Comprehensive income attributable to Kirby                   83,140,000  
Statements of cash flows [Abstract]                      
Net earnings                   84,872,000  
Provision for deferred income taxes                   32,775,000  
Decrease in cash flows resulting from changes in: [Abstract]                      
Accounts receivable                   (71,624,000)  
Inventory                   (71,985,000)  
Accrued and other liabilities                   38,459,000  
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member] | Distribution and Services [Member]                      
Statements of earnings [Abstract]                      
Revenues                   1,515,554,000  
ASC 606 [Member] | Effect of Change [Member]                      
Statements of earnings [Abstract]                      
Costs of sales and operating expenses                   (20,100,000)  
Operating income                   (7,900,000)  
Earnings before taxes on income                   (7,900,000)  
Provision for taxes on income                   2,106,000  
Net earnings attributable to Kirby                   (5,794,000)  
Statements of comprehensive income [Abstract]                      
Net earnings                   (5,794,000)  
Comprehensive income attributable to Kirby                   (5,794,000)  
Statements of cash flows [Abstract]                      
Net earnings                   (5,794,000)  
Provision for deferred income taxes                   2,106,000  
Decrease in cash flows resulting from changes in: [Abstract]                      
Accounts receivable                   84,135,000  
Inventory                   (72,700,000)  
Accrued and other liabilities                   (7,747,000)  
ASC 606 [Member] | Effect of Change [Member] | Distribution and Services [Member]                      
Statements of earnings [Abstract]                      
Revenues                   $ (28,000,000)