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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
EARNINGS PER SHARE [Abstract]
Net earnings attributable to Kirby	$ 32,471	$ 27,483
Undistributed earnings allocated to restricted shares	(156)	(190)
Income available to Kirby common stockholders - basic	32,315	27,293
Undistributed earnings allocated to restricted shares	156	190
Undistributed earnings reallocated to restricted shares	(156)	(189)
Income available to Kirby common stockholders - diluted	$ 32,315	$ 27,294
Shares outstanding [Abstract]
Weighted average common stock issued and outstanding (in shares)	59,678	53,914
Weighted average unvested restricted stock (in shares)	(286)	(372)
Weighted average common stock outstanding - basic (in shares)	59,392	53,542
Dilutive effect of stock options and restricted stock units (in shares)	101	67
Weighted average common stock outstanding - diluted (in shares)	59,493	53,609
Net earnings per share attributable to Kirby common stockholders [Abstract]
Basic (in dollars per share)	$ 0.54	$ 0.51
Diluted (in dollars per share)	$ 0.54	$ 0.51
Antidilutive securities excluded from computation of earnings per share (in shares)	467	487

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