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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
EARNINGS PER SHARE [Abstract]    
Net earnings attributable to Kirby $ 38,099 $ 61,078
Undistributed earnings allocated to restricted shares (240) (345)
Income available to Kirby common stockholders - basic 37,859 60,733
Undistributed earnings allocated to restricted shares 240 345
Undistributed earnings reallocated to restricted shares (239) (345)
Income available to Kirby common stockholders - diluted $ 37,860 $ 60,733
Shares Outstanding [Abstract]    
Weighted average common stock issued and outstanding (in shares) 53,780,000 55,897,000
Weighted average unvested restricted stock (in shares) (338,000) (316,000)
Weighted average common stock outstanding - basic (in shares) 53,442,000 55,581,000
Dilutive effect of stock options (in shares) 41,000 122,000
Weighted average common stock outstanding - diluted (in shares) 53,483,000 55,703,000
Net earnings per share attributable to Kirby common stockholders [Abstract]    
Basic (in dollars per share) $ 0.71 $ 1.09
Diluted (in dollars per share) $ 0.71 $ 1.09
Antidilutive securities excluded from computation of earnings per share (in shares) 542,000 234,000