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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
EARNINGS PER SHARE [Abstract]        
Net earnings attributable to Kirby $ 74,992 $ 63,093 $ 137,238 $ 119,671
Undistributed earnings allocated to restricted shares (435) (459) (806) (859)
Income available to Kirby common stockholders - basic 74,557 62,634 136,432 118,812
Undistributed earnings allocated to restricted shares 435 459 806 859
Undistributed earnings reallocated to restricted shares (434) (457) (803) (856)
Income available to Kirby common stockholders - diluted $ 74,558 $ 62,636 $ 136,435 $ 118,815
Weighted average common stock issued and outstanding (in shares) 57,010,000 56,752,000 56,957,000 56,712,000
Weighted average unvested restricted stock (in shares) (331,000) (413,000) (334,000) (407,000)
Weighted average common stock outstanding - basic (in shares) 56,679,000 56,339,000 56,623,000 56,305,000
Dilutive effect of stock options (in shares) 190,000 190,000 203,000 188,000
Weighted average common stock outstanding - diluted (in shares) 56,869,000 56,529,000 56,826,000 56,493,000
Net earnings per share attributable to Kirby common stockholders:        
Basic (in dollars per share) $ 1.32 $ 1.11 $ 2.41 $ 2.11
Diluted (in dollars per share) $ 1.31 $ 1.11 $ 2.40 $ 2.10
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)     117,000 165,000