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Summary of Significant Accounting Policies, Accounting Standards (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating expense | $ (19,241) | $ 67,957 | $ 55,853 | $ 50,720 | $ (52,600) | $ 52,929 | $ 47,252 | $ 46,044 | $ 155,289 | $ 93,625 | $ 247,370 |
Nonoperating expense | (1,140) | (1,454) | (1,541) | (1,591) | (902) | (320) | (228) | 589 |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,970,697 | 2,214,418 | 1,770,673 |
Costs of sales and operating expenses |  |  |  |  |  |  |  |  | 2,160,946 | 1,558,098 | 1,124,666 |
Operating income | (19,241) | 67,957 | 55,853 | 50,720 | (52,600) | 52,929 | 47,252 | 46,044 | 155,289 | 93,625 | 247,370 |
Earnings before taxes on income | (30,292) | 57,066 | 44,854 | 42,531 | (58,860) | 47,861 | 43,015 | 40,998 | 114,159 | 73,014 | 227,746 |
Provision for taxes on income | 5,961 | (15,116) | (16,061) | (9,865) | 290,357 | (19,072) | (17,043) | (13,353) | (35,081) | 240,889 | (84,942) |
Net earnings attributable to Kirby | (24,437) | 41,816 | 28,602 | 32,471 | 231,319 | 28,607 | 25,778 | 27,483 | 78,452 | 313,187 | 141,406 |
Statements of comprehensive income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | (24,331) | 41,950 | 28,793 | 32,666 | 231,497 | 28,789 | 25,972 | 27,645 | 79,078 | 313,903 | 142,804 |
Comprehensive income attributable to Kirby |  |  |  |  |  |  |  |  | 77,346 | 331,789 | 135,085 |
Statements of cash flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | (24,331) | $ 41,950 | $ 28,793 | $ 32,666 | 231,497 | $ 28,789 | $ 25,972 | $ 27,645 | 79,078 | 313,903 | 142,804 |
Provision for deferred income taxes |  |  |  |  |  |  |  |  | 34,881 | (256,263) | 51,296 |
Decrease in cash flows resulting from changes in: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  | 12,511 | (60,405) | (12,750) |
Inventory |  |  |  |  |  |  |  |  | (144,685) | 19,673 | 3,182 |
Accrued and other liabilities |  |  |  |  |  |  |  |  | 30,712 | (3,105) | 16,051 |
Balance sheets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | 417,644 |  |  |  | 452,222 |  |  |  | 417,644 | 452,222 |  |
Inventories - net | 507,441 |  |  |  | 315,729 |  |  |  | 507,441 | 315,729 |  |
Total assets | 5,871,594 |  |  |  | 5,127,427 |  |  |  | 5,871,594 | 5,127,427 | 4,289,895 |
Deferred revenues | 80,123 |  |  |  | 48,347 |  |  |  | 80,123 | 48,347 |  |
Deferred income taxes | 542,785 |  |  |  | 468,451 |  |  |  | 542,785 | 468,451 |  |
Retained earnings | 2,723,592 |  |  |  | 2,646,937 |  |  |  | 2,723,592 | 2,646,937 |  |
Total liabilities and equity | 5,871,594 |  |  |  | 5,127,427 |  |  |  | 5,871,594 | 5,127,427 |  |
Distribution and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,487,554 | 890,312 | 298,780 |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Kirby |  |  |  |  |  |  |  |  | 78,452 | 313,187 | 141,406 |
ASU 2016-09 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings |  |  |  |  | 0 |  |  |  |  | 0 | 8,486 | $ 0
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings |  |  |  |  | 7,925 |  |  |  |  | 7,925 | 0 | 0
Reclassification from AOCI to retained earnings | (7,925) |  |  |  |  |  |  |  | (7,925) |  |  |
ASU 2018-02 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings |  |  |  |  | (7,925) |  |  |  |  | (7,925) | 0 | 0
Reclassification from AOCI to retained earnings | 7,925 |  |  |  |  |  |  |  | 7,925 |  |  |
ASU 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating expense |  |  |  |  |  |  |  |  |  | (621) | (2,175) |
Nonoperating expense |  |  |  |  |  |  |  |  |  | (621) | (2,175) |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | (621) | (2,175) |
ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings | (9,722) |  |  |  |  |  |  |  | (9,722) |  |  |
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating expense |  |  |  |  |  |  |  |  | 163,189 |  |  |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Costs of sales and operating expenses |  |  |  |  |  |  |  |  | 2,181,046 |  |  |
Operating income |  |  |  |  |  |  |  |  | 163,189 |  |  |
Earnings before taxes on income |  |  |  |  |  |  |  |  | 122,059 |  |  |
Provision for taxes on income |  |  |  |  |  |  |  |  | (37,187) |  |  |
Net earnings attributable to Kirby |  |  |  |  |  |  |  |  | 84,246 |  |  |
Statements of comprehensive income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  | 84,872 |  |  |
Comprehensive income attributable to Kirby |  |  |  |  |  |  |  |  | 83,140 |  |  |
Statements of cash flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  | 84,872 |  |  |
Provision for deferred income taxes |  |  |  |  |  |  |  |  | 32,775 |  |  |
Decrease in cash flows resulting from changes in: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  | (71,624) |  |  |
Inventory |  |  |  |  |  |  |  |  | (71,985) |  |  |
Accrued and other liabilities |  |  |  |  |  |  |  |  | 38,459 |  |  |
Balance sheets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | 501,779 |  |  |  |  |  |  |  | 501,779 |  |  |
Inventories - net | 434,741 |  |  |  |  |  |  |  | 434,741 |  |  |
Total assets | 5,883,029 |  |  |  |  |  |  |  | 5,883,029 |  |  |
Deferred revenues | 70,858 |  |  |  |  |  |  |  | 70,858 |  |  |
Deferred income taxes | 547,991 |  |  |  |  |  |  |  | 547,991 |  |  |
Retained earnings | 2,739,086 |  |  |  |  |  |  |  | 2,739,086 |  |  |
Total liabilities and equity | 5,883,029 |  |  |  |  |  |  |  | 5,883,029 |  |  |
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member] | Distribution and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,515,554 |  |  |
ASC 606 [Member] | Effect of Change [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating expense |  |  |  |  |  |  |  |  | (7,900) |  |  |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Costs of sales and operating expenses |  |  |  |  |  |  |  |  | (20,100) |  |  |
Operating income |  |  |  |  |  |  |  |  | (7,900) |  |  |
Earnings before taxes on income |  |  |  |  |  |  |  |  | (7,900) |  |  |
Provision for taxes on income |  |  |  |  |  |  |  |  | 2,106 |  |  |
Net earnings attributable to Kirby |  |  |  |  |  |  |  |  | (5,794) |  |  |
Statements of comprehensive income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  | (5,794) |  |  |
Comprehensive income attributable to Kirby |  |  |  |  |  |  |  |  | (5,794) |  |  |
Statements of cash flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  | (5,794) |  |  |
Provision for deferred income taxes |  |  |  |  |  |  |  |  | 2,106 |  |  |
Decrease in cash flows resulting from changes in: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  | 84,135 |  |  |
Inventory |  |  |  |  |  |  |  |  | (72,700) |  |  |
Accrued and other liabilities |  |  |  |  |  |  |  |  | (7,747) |  |  |
Balance sheets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | (84,135) |  |  |  |  |  |  |  | (84,135) |  |  |
Inventories - net | 72,700 |  |  |  |  |  |  |  | 72,700 |  |  |
Total assets | (11,435) |  |  |  |  |  |  |  | (11,435) |  |  |
Deferred revenues | 9,265 |  |  |  |  |  |  |  | 9,265 |  |  |
Deferred income taxes | (5,206) |  |  |  |  |  |  |  | (5,206) |  |  |
Retained earnings | (15,494) |  |  |  |  |  |  |  | (15,494) |  |  |
Total liabilities and equity | (11,435) |  |  |  |  |  |  |  | (11,435) |  |  |
ASC 606 [Member] | Effect of Change [Member] | Distribution and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (28,000) |  |  |
ASC 606 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings | (9,722) |  |  |  | $ 9,722 |  |  |  | (9,722) | $ 9,722 | $ 0 | $ 0
ASU 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets | 185,000 |  |  |  |  |  |  |  | 185,000 |  |  |
Liabilities for operating leases | $ 180,000 |  |  |  |  |  |  |  | $ 180,000 |  |  |

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