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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
EARNINGS PER SHARE [Abstract]        
Net earnings attributable to Kirby $ 25,778 $ 38,942 $ 53,261 $ 77,041
Undistributed earnings allocated to restricted shares (196) (284) (386) (524)
Income available to Kirby common stockholders - basic 25,582 38,658 52,875 76,517
Undistributed earnings allocated to restricted shares 196 284 386 524
Undistributed earnings reallocated to restricted shares (196) (285) (386) (524)
Income available to Kirby common stockholders - diluted $ 25,582 $ 38,657 $ 52,875 $ 76,517
Shares Outstanding [Abstract]        
Weighted average common stock issued and outstanding (in shares) 53,996 53,844 53,955 53,813
Weighted average unvested restricted stock (in shares) (410) (393) (391) (367)
Weighted average common stock outstanding - basic (in shares) 53,586 53,451 53,564 53,446
Dilutive effect of stock options (in shares) 59 75 63 59
Weighted average common stock outstanding - diluted (in shares) 53,645 53,526 53,627 53,505
Net earnings per share attributable to Kirby common stockholders [Abstract]        
Basic (in dollars per share) $ 0.48 $ 0.72 $ 0.99 $ 1.43
Diluted (in dollars per share) $ 0.48 $ 0.72 $ 0.99 $ 1.43
Antidilutive securities excluded from computation of earnings per share (in shares)     478 243