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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net Income (Loss) Attributable to Parent [Abstract]        
Net earnings attributable to Kirby $ 57,367 $ 28,457 $ 98,065 $ 45,891
Undistributed earnings allocated to restricted shares (22) (10) (21) (11)
Earnings (loss) available to Kirby common stockholders - basic 57,345 28,447 98,044 45,880
Undistributed earnings allocated to restricted shares 22 10 21 11
Undistributed earnings reallocated to restricted shares (22) (10) (21) (11)
Earnings (loss) available to Kirby common stockholders - diluted $ 57,345 $ 28,447 $ 98,044 $ 45,880
Shares outstanding [Abstract]        
Weighted average common stock issued and outstanding (in shares) 59,829,000 60,222,000 59,905,000 60,202,000
Weighted average unvested restricted stock (in shares) (23,000) (20,000) (13,000) (14,000)
Weighted Average Number of Shares Outstanding, Basic (in shares) 59,806,000 60,202,000 59,892,000 60,188,000
Dilutive effect of stock options and restricted stock units (in shares) 279,000 265,000 287,000 277,000
Weighted Average Number of Shares Outstanding, Diluted (in shares) 60,085,000 60,467,000 60,179,000 60,465,000
Net earnings per share basic attributable to Kirby common stockholders:        
Basic $ 0.96 $ 0.47 $ 1.64 $ 0.76
Net earnings per share diluted attributable to Kirby common stockholders:        
Diluted $ 0.95 $ 0.47 $ 1.63 $ 0.76
Antidilutive securities excluded from computation of earnings per share (in shares)     300,000 400,000
RSUs [Member]        
Net earnings per share diluted attributable to Kirby common stockholders:        
Antidilutive securities excluded from computation of earnings per share (in shares)     0 12,000