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ACCOUNTING STANDARDS ADOPTIONS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating expense | $ 690,968 | $ 445,661 |
Nonoperating expense | (1,591) | 589 |
Statements of earnings [Abstract] |  |  |
Revenues | 741,688 | 491,705 |
Costs of sales and operating expenses | 553,317 | 344,799 |
Operating income | 50,720 | 46,044 |
Earnings before taxes on income | 42,531 | 40,998 |
Provision for taxes on income | (9,865) | (13,353) |
Net earnings attributable to Kirby | 32,471 | 27,483 |
Statements of comprehensive income [Abstract] |  |  |
Net earnings | 32,666 | 27,645 |
Comprehensive income attributable to Kirby | 25,396 | 28,229 |
Balance sheets [Abstract] |  |  |
Trade receivables | 485,865 |  | $ 452,222
Inventories | 372,182 |  | 315,729
Total assets | 5,714,500 |  | 5,127,427
Deferred revenues | 81,216 |  | 48,347
Deferred income taxes | 517,421 |  | 468,451
Retained earnings | 2,677,611 |  | 2,646,937
Total liabilities and equity | 5,714,500 |  | $ 5,127,427
Statements of cash flows [Abstract] |  |  |
Net earnings | 32,666 | 27,645 |
Provision for deferred income taxes | 8,846 | 8,562 |
Decrease in cash flows resulting from changes in operating assets and liabilities, net | (87,926) | (8,140) |
Distribution and Services [Member] |  |  |
Statements of earnings [Abstract] |  |  |
Revenues | 401,285 | 148,053 |
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification from AOCI to retained earnings | (7,925) |  |
ASU 2018-02 [Member] | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification from AOCI to retained earnings | 7,925 |  |
ASU 2017-07 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating expense |  | (473) |
Nonoperating expense |  | $ 473 |
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member] |  |  |
Statements of earnings [Abstract] |  |  |
Costs of sales and operating expenses | 574,817 |  |
Operating income | 56,520 |  |
Earnings before taxes on income | 48,331 |  |
Provision for taxes on income | (11,216) |  |
Net earnings attributable to Kirby | 36,920 |  |
Statements of comprehensive income [Abstract] |  |  |
Net earnings | 37,115 |  |
Comprehensive income attributable to Kirby | 29,845 |  |
Balance sheets [Abstract] |  |  |
Trade receivables | 495,875 |  |
Inventories | 350,682 |  |
Total assets | 5,703,010 |  |
Deferred revenues | 63,926 |  |
Deferred income taxes | 518,772 |  |
Retained earnings | 2,682,060 |  |
Total liabilities and equity | 5,703,010 |  |
Statements of cash flows [Abstract] |  |  |
Net earnings | 37,115 |  |
Provision for deferred income taxes | 10,197 |  |
Decrease in cash flows resulting from changes in operating assets and liabilities, net | (76,436) |  |
ASC 606 [Member] | Balances without Adoption of ASC 606 [Member] | Distribution and Services [Member] |  |  |
Statements of earnings [Abstract] |  |  |
Revenues | 428,585 |  |
ASC 606 [Member] | Effect of Change [Member] |  |  |
Statements of earnings [Abstract] |  |  |
Costs of sales and operating expenses | (21,500) |  |
Operating income | (5,800) |  |
Earnings before taxes on income | (5,800) |  |
Provision for taxes on income | 1,351 |  |
Net earnings attributable to Kirby | (4,449) |  |
Statements of comprehensive income [Abstract] |  |  |
Net earnings | (4,449) |  |
Comprehensive income attributable to Kirby | (4,449) |  |
Balance sheets [Abstract] |  |  |
Trade receivables | (10,010) |  |
Inventories | 21,500 |  |
Total assets | 11,490 |  |
Deferred revenues | 17,290 |  |
Deferred income taxes | (1,351) |  |
Retained earnings | (4,449) |  |
Total liabilities and equity | 11,490 |  |
Statements of cash flows [Abstract] |  |  |
Net earnings | (4,449) |  |
Provision for deferred income taxes | (1,351) |  |
Decrease in cash flows resulting from changes in operating assets and liabilities, net | (11,490) |  |
ASC 606 [Member] | Effect of Change [Member] | Distribution and Services [Member] |  |  |
Statements of earnings [Abstract] |  |  |
Revenues | (27,300) |  |
ASC 606 [Member] | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect on retained earnings | $ (9,722) |  |

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