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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Income (Loss) Attributable to Parent [Abstract]      
Net earnings (loss) attributable to Kirby $ (246,954) $ (272,546) $ 142,347
Undistributed earnings allocated to restricted shares 0 0 369
Income (loss) available to Kirby common stockholders - basic (246,954) (272,546) 141,978
Undistributed earnings allocated to restricted shares 0 0 (369)
Undistributed earnings reallocated to restricted shares 0 0 369
Income (loss) available to Kirby common stockholders - diluted $ (246,954) $ (272,546) $ 141,978
Shares outstanding [Abstract]      
Weighted average common stock issued and outstanding (in shares) 60,099 60,021 59,905
Weighted average unvested restricted stock (in shares) (46) (109) (155)
Weighted average common stock outstanding - basic (in shares) 60,053 59,912 59,750
Dilutive effect of stock options and restricted stock units (in shares) 0 0 159
Weighted average common stock outstanding - diluted (in shares) 60,053 59,912 59,909
Net earnings (loss) per share attributable to Kirby common stockholders:      
Basic (in dollars per share) $ (4.11) $ (4.55) $ 2.38
Diluted (in dollars per share) $ (4.11) $ (4.55) $ 2.37
Antidilutive securities excluded from computation of earnings per share (in shares) 567,000 681,000 187,000
RSUs [Member]      
Net earnings (loss) per share attributable to Kirby common stockholders:      
Antidilutive securities excluded from computation of earnings per share (in shares) 7,000 11,000 0