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Quarterly Results (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Results (Unaudited) [Abstract]                      
Revenues $ 484,138 $ 532,565 $ 543,156 $ 587,673 $ 668,297 $ 680,721 $ 628,054 $ 589,246 $ 2,147,532 $ 2,566,318 $ 2,242,195
Costs and expenses 400,178 437,115 445,113 486,136 554,646 552,642 501,556 482,443 1,766,870 2,090,506 1,806,013
Gain (loss) on disposition of assets 426 (400) 91 1,555 156 47 527 51 1,672 781 888
Operating income 84,386 95,050 98,134 103,092 113,807 128,126 127,025 106,854 380,662 475,812 436,182
Other income (expense) 9 22 (303) 60 125 27 123 (236) (663) (345) 20
Interest expense (4,280) (4,449) (4,759) (5,250) (5,149) (5,225) (5,469) (5,618) (18,738) (21,461) (27,872)
Earnings before taxes on income 80,115 90,623 93,072 97,902 108,783 122,928 121,679 101,000 361,712 454,390 408,678
Provision for taxes on income (29,043) (33,512) (34,696) (36,491) (40,310) (45,715) (45,768) (37,989) (133,742) (169,782) (152,379)
Net earnings 51,072 57,111 58,376 61,411 68,473 77,213 75,911 63,011 227,970 284,608 256,299
Less: Net earnings attributable to noncontrolling interests (384) (268) (301) (333) (422) (496) (919) (765) (1,286) (2,602) (3,238)
Net earnings attributable to Kirby $ 50,688 $ 56,843 $ 58,075 $ 61,078 $ 68,051 $ 76,717 $ 74,992 $ 62,246 $ 226,684 $ 282,006 $ 253,061
Net earnings per share attributable to Kirby common stockholders [Abstract]                      
Basic (in dollars per share) $ 0.94 $ 1.04 $ 1.04 $ 1.09 $ 1.19 $ 1.34 $ 1.32 $ 1.09 $ 4.12 $ 4.95 $ 4.46
Diluted (in dollars per share) $ 0.94 $ 1.04 $ 1.04 $ 1.09 $ 1.19 $ 1.34 $ 1.31 $ 1.09 $ 4.11 $ 4.93 $ 4.44