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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Net Income (Loss) Attributable to Parent [Abstract] |  |
Loss attributable to Kirby common stockholders - basic | $ (3,375) | $ (347,241)
Loss attributable to Kirby common stockholders - diluted | $ (3,375) | $ (347,241)
Shares outstanding [Abstract] |  |
Weighted average common stock issued and outstanding (in shares) | 60,074,000 | 59,983,000
Weighted average unvested restricted stock (in shares) | (58,000) | (100,000)
Weighted average common stock outstanding - basic (in shares) | 60,016,000 | 59,883,000
Weighted average common stock outstanding - diluted (in shares) | 60,016,000 | 59,883,000
Net loss per share attributable to Kirby common stockholders [Abstract] |  |
Basic (in dollars per share) | $ (0.06) | $ (5.80)
Diluted (in dollars per share) | $ (0.06) | $ (5.80)
Antidilutive securities excluded from computation of earnings per share (in shares) | 572,000 | 681,000
RSUs [Member] |  |
Net loss per share attributable to Kirby common stockholders [Abstract] |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 7,000 | 344,000

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