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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
EARNINGS PER SHARE [Abstract]        
Net earnings attributable to Kirby $ 38,942 $ 58,075 $ 77,041 $ 119,153
Undistributed earnings allocated to restricted shares (284) (350) (524) (696)
Income available to Kirby common stockholders - basic 38,658 57,725 76,517 118,457
Undistributed earnings allocated to restricted shares 284 350 524 696
Undistributed earnings reallocated to restricted shares (285) (349) (524) (695)
Income available to Kirby common stockholders - diluted $ 38,657 $ 57,726 $ 76,517 $ 118,458
Shares Outstanding [Abstract]        
Weighted average common stock issued and outstanding (in shares) 53,844,000 55,651,000 53,813,000 55,772,000
Weighted average unvested restricted stock (in shares) (393,000) (336,000) (367,000) (326,000)
Weighted average common stock outstanding - basic (in shares) 53,451,000 55,315,000 53,446,000 55,446,000
Dilutive effect of stock options (in shares) 75,000 117,000 59,000 119,000
Weighted average common stock outstanding - diluted (in shares) 53,526,000 55,432,000 53,505,000 55,565,000
Net earnings per share attributable to Kirby common stockholders [Abstract]        
Basic (in dollars per share) $ 0.72 $ 1.04 $ 1.43 $ 2.14
Diluted (in dollars per share) $ 0.72 $ 1.04 $ 1.43 $ 2.13
Antidilutive securities excluded from computation of earnings per share (in shares)     243,000 185,000