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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |
Net earnings attributable to Kirby | $ 47,987 | $ 41,816 | $ 139,570 | $ 102,889
Undistributed earnings allocated to restricted shares | (128) | (166) | (369) | (438)
Income available to Kirby common stockholders - basic | 47,859 | 41,650 | 139,201 | 102,451
Undistributed earnings allocated to restricted shares | 128 | 166 | 369 | 438
Undistributed earnings reallocated to restricted shares | (128) | (165) | (368) | (437)
Income available to Kirby common stockholders - diluted | $ 47,859 | $ 41,651 | $ 139,202 | $ 102,452
Shares outstanding [Abstract] |  |  |  |
Weighted average common stock issued and outstanding (in shares) | 59,908,000 | 59,875,000 | 59,891,000 | 59,782,000
Weighted average unvested restricted stock (in shares) | (159,000) | (237,000) | (158,000) | (255,000)
Weighted average common stock outstanding - basic (in shares) | 59,749,000 | 59,638,000 | 59,733,000 | 59,527,000
Dilutive effect of stock options and restricted stock units (in shares) | 157,000 | 146,000 | 146,000 | 141,000
Weighted average common stock outstanding - diluted (in shares) | 59,906,000 | 59,784,000 | 59,879,000 | 59,668,000
Net earnings per share attributable to Kirby common stockholders [Abstract] |  |  |  |
Basic (in dollars per share) | $ 0.80 | $ 0.70 | $ 2.33 | $ 1.72
Diluted (in dollars per share) | $ 0.80 | $ 0.70 | $ 2.32 | $ 1.72
Antidilutive securities excluded from computation of earnings per share (in shares) |  |  | 297,000 | 189,000
RSUs [Member] |  |  |  |
Net earnings per share attributable to Kirby common stockholders [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) |  |  | 5,000 |

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