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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Income (Loss) Attributable to Parent [Abstract]        
Net earnings (loss) attributable to Kirby $ 25,002 $ 47,287 $ (322,239) $ 91,583
Undistributed earnings allocated to restricted shares (46) (122) 0 (241)
Income (loss) available to Kirby common stockholders - basic 24,956 47,165 (322,239) 91,342
Undistributed earnings allocated to restricted shares 46 122 0 241
Undistributed earnings reallocated to restricted shares (46) (122) 0 (240)
Income (loss) available to Kirby common stockholders - diluted $ 24,956 $ 47,165 $ (322,239) $ 91,343
Shares outstanding [Abstract]        
Weighted average common stock issued and outstanding (in shares) 60,023,000 59,894,000 60,003,000 59,882,000
Weighted average unvested restricted stock (in shares) (111,000) (154,000) (105,000) (157,000)
Weighted average common stock outstanding - basic (in shares) 59,912,000 59,740,000 59,898,000 59,725,000
Dilutive effect of stock options and restricted stock units (in shares) 25,000 167,000 0 140,000
Weighted average common stock outstanding - diluted (in shares) 59,937,000 59,907,000 59,898,000 59,865,000
Net earnings (loss) per share attributable to Kirby common stockholders:        
Basic (in dollars per share) $ 0.42 $ 0.79 $ (5.38) $ 1.53
Diluted (in dollars per share) $ 0.42 $ 0.79 $ (5.38) $ 1.53
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 4,000