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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net Income (Loss) Attributable to Parent [Abstract]        
Net earnings (loss) attributable to Kirby $ 27,489 $ 47,987 $ (294,750) $ 139,570
Undistributed earnings allocated to restricted shares (57) (128) 0 (369)
Income (loss) available to Kirby common stockholders - basic 27,432 47,859 (294,750) 139,201
Undistributed earnings allocated to restricted shares 57 128 0 369
Undistributed earnings reallocated to restricted shares (57) (128) 0 (368)
Income (loss) available to Kirby common stockholders - diluted $ 27,432 $ 47,859 $ (294,750) $ 139,202
Shares outstanding [Abstract]        
Weighted average common stock issued and outstanding (in shares) 60,038,000 59,908,000 60,015,000 59,891,000
Weighted average unvested restricted stock (in shares) (123,000) (159,000) (112,000) (158,000)
Weighted average common stock outstanding - basic (in shares) 59,915,000 59,749,000 59,903,000 59,733,000
Dilutive effect of stock options and restricted stock units (in shares) 16,000 157,000 0 146,000
Weighted average common stock outstanding - diluted (in shares) 59,931,000 59,906,000 59,903,000 59,879,000
Net earnings (loss) per share attributable to Kirby common stockholders:        
Basic (in dollars per share) $ 0.46 $ 0.80 $ (4.92) $ 2.33
Diluted (in dollars per share) $ 0.46 $ 0.80 $ (4.92) $ 2.32
Antidilutive securities excluded from computation of earnings per share (in shares)     681,000 297,000
RSUs [Member]        
Net earnings (loss) per share attributable to Kirby common stockholders:        
Antidilutive securities excluded from computation of earnings per share (in shares)     162,000 5,000