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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Income (Loss) Attributable to Parent [Abstract]        
Net earnings (loss) attributable to Kirby $ (264,730) $ 27,489 $ (257,915) $ (294,750)
Undistributed earnings allocated to restricted shares 0 (57) 0 0
Earnings (loss) available to common stockholders, basic, total (264,730) 27,432 (257,915) (294,750)
Undistributed earnings allocated to restricted shares 0 57 0 0
Undistributed earnings reallocated to restricted shares 0 (57) 0 0
Earnings (loss) available to Kirby common stockholders - diluted $ (264,730) $ 27,432 $ (257,915) $ (294,750)
Shares outstanding [Abstract]        
Weighted average common stock issued and outstanding (in shares) 60,109 60,038 60,095 60,015
Weighted average unvested restricted stock (in shares) (47) (123) (51) (112)
Weighted average common stock outstanding - basic (in shares) 60,062 59,915 60,044 59,903
Dilutive effect of stock options and restricted stock units (in shares) 0 16 0 0
Weighted average common stock outstanding - diluted (in shares) 60,062 59,931 60,044 59,903
Net earnings (loss) per share attributable to Kirby common stockholders        
Basic (in dollars per share) $ (4.41) $ 0.46 $ (4.30) $ (4.92)
Diluted (in dollars per share) $ (4.41) $ 0.46 $ (4.30) $ (4.92)
Antidilutive securities excluded from computation of earnings per share (in shares)     627,000 681,000
RSUs [Member]        
Net earnings (loss) per share attributable to Kirby common stockholders        
Antidilutive securities excluded from computation of earnings per share (in shares)     565,000 162,000