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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Kirby | $ 32,355 | $ 32,010 | $ 38,942 | $ 38,099 | $ 50,688 | $ 56,843 | $ 58,075 | $ 61,078 | $ 141,406 | $ 226,684 | $ 282,006
Undistributed earnings allocated to restricted shares |  |  |  |  |  |  |  |  | (999) | (1,345) | (1,643)
Income available to Kirby common stockholders - basic |  |  |  |  |  |  |  |  | 140,407 | 225,339 | 280,363
Undistributed earnings allocated to restricted shares |  |  |  |  |  |  |  |  | 999 | 1,345 | 1,643
Undistributed earnings reallocated to restricted shares |  |  |  |  |  |  |  |  | (997) | (1,343) | (1,637)
Income available to Kirby common stockholders - diluted |  |  |  |  |  |  |  |  | $ 140,409 | $ 225,341 | $ 280,369
Shares Outstanding [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding (in shares) |  |  |  |  |  |  |  |  | 53,834 | 55,056 | 57,006
Weighted average unvested restricted stock (in shares) |  |  |  |  |  |  |  |  | (380) | (327) | (332)
Weighted average common stock outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 53,454 | 54,729 | 56,674
Dilutive effect of stock options (in shares) |  |  |  |  |  |  |  |  | 58 | 97 | 193
Weighted average common stock outstanding - diluted (in shares) |  |  |  |  |  |  |  |  | 53,512 | 54,826 | 56,867
Net earnings per share attributable to Kirby common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.60 | $ 0.59 | $ 0.72 | $ 0.71 | $ 0.94 | $ 1.04 | $ 1.04 | $ 1.09 | $ 2.63 | $ 4.12 | $ 4.95
Diluted (in dollars per share) | $ 0.60 | $ 0.59 | $ 0.72 | $ 0.71 | $ 0.94 | $ 1.04 | $ 1.04 | $ 1.09 | $ 2.62 | $ 4.11 | $ 4.93
Antidilutive securities excluded from computation of earnings per share (in shares) |  |  |  |  |  |  |  |  | 240,000 | 227,000 | 75,000

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