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ACCOUNTING STANDARDS ADOPTIONS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements [Abstract] |  |  |  |  |
Operating expense | $ 636,888 | $ 488,345 | $ 2,074,674 | $ 1,360,082 |
Nonoperating expense | (1,454) | (320) | (4,586) | 41 |
Statements of earnings [Abstract] |  |  |  |  |
Revenues | 704,845 | 541,274 | 2,249,204 | 1,506,307 |
Costs of sales and operating expenses | 498,421 | 378,750 | 1,640,366 | 1,048,299 |
Operating income | 67,957 | 52,929 | 174,530 | 146,225 |
Earnings before taxes on income | 57,066 | 47,861 | 144,451 | 131,874 |
Provision for taxes on income | (15,116) | (19,072) | (41,042) | (49,468) |
Net earnings attributable to Kirby | 41,816 | 28,607 | 102,889 | 81,868 |
Statements of comprehensive income [Abstract] |  |  |  |  |
Net earnings | 41,950 | 28,789 | 103,409 | 82,406 |
Comprehensive income attributable to Kirby | 42,194 | 28,950 | 95,750 | 97,097 |
Statements of cash flows [Abstract] |  |  |  |  |
Net earnings | 41,950 | 28,789 | 103,409 | 82,406 |
Provision for deferred income taxes |  |  | 36,838 | 32,783 |
Decrease in cash flows resulting from changes in operating assets and liabilities, net |  |  | (66,707) | (28,592) |
Balance sheets [Abstract] |  |  |  |  |
Trade receivables | 400,870 |  | 400,870 |  | $ 452,222
Inventories - net | 453,173 |  | 453,173 |  | 315,729
Total assets | 5,854,332 |  | 5,854,332 |  | 5,127,427
Deferred revenues | 75,843 |  | 75,843 |  | 48,347
Deferred income taxes | 544,882 |  | 544,882 |  | 468,451
Retained earnings | 2,748,029 |  | 2,748,029 |  | 2,646,937
Total liabilities and equity | 5,854,332 |  | 5,854,332 |  | $ 5,127,427
Distribution and Services [Member] |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |
Revenues | 322,805 | 222,464 | 1,148,598 | 512,580 |
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |
Reclassification from AOCI to retained earnings | (7,925) |  | (7,925) |  |
ASU 2018-02 [Member] | Retained Earnings [Member] |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |
Reclassification from AOCI to retained earnings | 7,925 |  | 7,925 |  |
ASU 2017-07 [Member] |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |
Operating expense |  | (433) |  | (189) |
Nonoperating expense |  | $ 433 |  | $ 189 |
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member] |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |
Costs of sales and operating expenses | 520,721 |  | 1,645,166 |  |
Operating income | 72,657 |  | 175,530 |  |
Earnings before taxes on income | 61,766 |  | 145,451 |  |
Provision for taxes on income | (16,282) |  | (41,295) |  |
Net earnings attributable to Kirby | 45,350 |  | 103,636 |  |
Statements of comprehensive income [Abstract] |  |  |  |  |
Net earnings | 45,484 |  | 104,156 |  |
Comprehensive income attributable to Kirby | 45,728 |  | 96,497 |  |
Statements of cash flows [Abstract] |  |  |  |  |
Net earnings | 45,484 |  | 104,156 |  |
Provision for deferred income taxes |  |  | 36,585 |  |
Decrease in cash flows resulting from changes in operating assets and liabilities, net |  |  | (67,201) |  |
Balance sheets [Abstract] |  |  |  |  |
Trade receivables | 466,599 |  | 466,599 |  |
Inventories - net | 395,773 |  | 395,773 |  |
Total assets | 5,862,661 |  | 5,862,661 |  |
Deferred revenues | 70,372 |  | 70,372 |  |
Deferred income taxes | 548,235 |  | 548,235 |  |
Retained earnings | 2,758,476 |  | 2,758,476 |  |
Total liabilities and equity | 5,862,661 |  | 5,862,661 |  |
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member] | Distribution and Services [Member] |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |
Revenues | 349,805 |  | 1,154,398 |  |
ASC 606 [Member] | Effect of Change [Member] |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |
Costs of sales and operating expenses | (22,300) |  | (4,800) |  |
Operating income | (4,700) |  | (1,000) |  |
Earnings before taxes on income | (4,700) |  | (1,000) |  |
Provision for taxes on income | 1,166 |  | 253 |  |
Net earnings attributable to Kirby | (3,534) |  | (747) |  |
Statements of comprehensive income [Abstract] |  |  |  |  |
Net earnings | (3,534) |  | (747) |  |
Comprehensive income attributable to Kirby | (3,534) |  | (747) |  |
Statements of cash flows [Abstract] |  |  |  |  |
Net earnings | (3,534) |  | (747) |  |
Provision for deferred income taxes |  |  | 253 |  |
Decrease in cash flows resulting from changes in operating assets and liabilities, net |  |  | 494 |  |
Balance sheets [Abstract] |  |  |  |  |
Trade receivables | (65,729) |  | (65,729) |  |
Inventories - net | 57,400 |  | 57,400 |  |
Total assets | (8,329) |  | (8,329) |  |
Deferred revenues | 5,471 |  | 5,471 |  |
Deferred income taxes | (3,353) |  | (3,353) |  |
Retained earnings | (10,447) |  | (10,447) |  |
Total liabilities and equity | (8,329) |  | (8,329) |  |
ASC 606 [Member] | Effect of Change [Member] | Distribution and Services [Member] |  |  |  |  |
Statements of earnings [Abstract] |  |  |  |  |
Revenues | (27,000) |  | (5,800) |  |
ASC 606 [Member] | Retained Earnings [Member] |  |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |  |
Cumulative effect on retained earnings | $ (9,722) |  | $ (9,722) |  |

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