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Quarterly Results (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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
Quarterly Results (Unaudited) [Abstract]                      
Revenues $ 435,650 $ 434,708 $ 441,582 $ 458,733 $ 484,138 $ 532,565 $ 543,156 $ 587,673 $ 1,770,673 $ 2,147,532 $ 2,566,318
Costs and expenses 378,684 378,400 374,868 393,399 400,178 437,115 445,113 486,136 1,525,478 1,766,870 2,090,506
Gain (loss) on disposition of assets (166) (122) 94 67 426 (400) 91 1,555 (127) 1,672 781
Operating income 56,800 56,186 66,808 65,401 84,386 95,050 98,134 103,092 245,195 380,662 475,812
Other income (expense) 47 (120) 179 135 9 22 (303) 60 (291) (663) (345)
Interest expense (4,477) (4,507) (4,513) (4,193) (4,280) (4,449) (4,759) (5,250) (17,690) (18,738) (21,461)
Earnings before taxes on income 52,370 51,559 62,474 61,343 80,115 90,623 93,072 97,902 227,746 361,712 454,390
Provision for taxes on income (19,512) (19,206) (23,365) (22,859) (29,043) (33,512) (34,696) (36,491) (84,942) (133,742) (169,782)
Net earnings 32,858 32,353 39,109 38,484 51,072 57,111 58,376 61,411 142,804 227,970 284,608
Less: Net earnings attributable to noncontrolling interests (503) (343) (167) (385) (384) (268) (301) (333) (1,398) (1,286) (2,602)
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
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