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Quarterly Results (Schedule Of Quarterly Results) (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Results (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 668,297 us-gaap_Revenues | $ 680,721 us-gaap_Revenues | $ 628,054 us-gaap_Revenues | $ 589,246 us-gaap_Revenues | $ 568,397 us-gaap_Revenues | $ 551,105 us-gaap_Revenues | $ 563,908 us-gaap_Revenues | $ 558,785 us-gaap_Revenues | $ 2,566,318 us-gaap_Revenues | $ 2,242,195 us-gaap_Revenues | $ 2,112,658 us-gaap_Revenues
Costs and expenses | 554,646 us-gaap_CostsAndExpenses | 552,642 us-gaap_CostsAndExpenses | 501,556 us-gaap_CostsAndExpenses | 482,443 us-gaap_CostsAndExpenses | 459,813 us-gaap_CostsAndExpenses | 432,991 us-gaap_CostsAndExpenses | 455,193 us-gaap_CostsAndExpenses | 458,904 us-gaap_CostsAndExpenses | 2,090,506 us-gaap_CostsAndExpenses | 1,806,013 us-gaap_CostsAndExpenses | 1,747,825 us-gaap_CostsAndExpenses
Gain (loss) on disposition of assets | 156 us-gaap_GainLossOnDispositionOfAssets | 47 us-gaap_GainLossOnDispositionOfAssets | 527 us-gaap_GainLossOnDispositionOfAssets | 51 us-gaap_GainLossOnDispositionOfAssets | 160 us-gaap_GainLossOnDispositionOfAssets | 223 us-gaap_GainLossOnDispositionOfAssets | 537 us-gaap_GainLossOnDispositionOfAssets | (32)us-gaap_GainLossOnDispositionOfAssets | 781 us-gaap_GainLossOnDispositionOfAssets | 888 us-gaap_GainLossOnDispositionOfAssets | (14)us-gaap_GainLossOnDispositionOfAssets
Operating income | 113,807 us-gaap_OperatingIncomeLoss | 128,126 us-gaap_OperatingIncomeLoss | 127,025 us-gaap_OperatingIncomeLoss | 106,854 us-gaap_OperatingIncomeLoss | 108,744 us-gaap_OperatingIncomeLoss | 118,337 us-gaap_OperatingIncomeLoss | 109,252 us-gaap_OperatingIncomeLoss | 99,849 us-gaap_OperatingIncomeLoss | 475,812 us-gaap_OperatingIncomeLoss | 436,182 us-gaap_OperatingIncomeLoss | 364,833 us-gaap_OperatingIncomeLoss
Other income (expense) | 125 us-gaap_NonoperatingIncomeExpense | 27 us-gaap_NonoperatingIncomeExpense | 123 us-gaap_NonoperatingIncomeExpense | (236)us-gaap_NonoperatingIncomeExpense | 132 us-gaap_NonoperatingIncomeExpense | 60 us-gaap_NonoperatingIncomeExpense | 101 us-gaap_NonoperatingIncomeExpense | 75 us-gaap_NonoperatingIncomeExpense | (345)us-gaap_NonoperatingIncomeExpense | 20 us-gaap_NonoperatingIncomeExpense | (198)us-gaap_NonoperatingIncomeExpense
Interest expense | (5,149)us-gaap_InterestExpense | (5,225)us-gaap_InterestExpense | (5,469)us-gaap_InterestExpense | (5,618)us-gaap_InterestExpense | (5,971)us-gaap_InterestExpense | (6,694)us-gaap_InterestExpense | (7,219)us-gaap_InterestExpense | (7,988)us-gaap_InterestExpense | (21,461)us-gaap_InterestExpense | (27,872)us-gaap_InterestExpense | (24,385)us-gaap_InterestExpense
Earnings before taxes on income | 108,783 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 122,928 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 121,679 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 101,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 102,905 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 111,703 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 102,134 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 91,936 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 454,390 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 408,678 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 340,526 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for taxes on income | (40,310)us-gaap_IncomeTaxExpenseBenefit | (45,715)us-gaap_IncomeTaxExpenseBenefit | (45,768)us-gaap_IncomeTaxExpenseBenefit | (37,989)us-gaap_IncomeTaxExpenseBenefit | (37,646)us-gaap_IncomeTaxExpenseBenefit | (42,007)us-gaap_IncomeTaxExpenseBenefit | (38,342)us-gaap_IncomeTaxExpenseBenefit | (34,384)us-gaap_IncomeTaxExpenseBenefit | (169,782)us-gaap_IncomeTaxExpenseBenefit | (152,379)us-gaap_IncomeTaxExpenseBenefit | (127,907)us-gaap_IncomeTaxExpenseBenefit
Net earnings | 68,473 us-gaap_ProfitLoss | 77,213 us-gaap_ProfitLoss | 75,911 us-gaap_ProfitLoss | 63,011 us-gaap_ProfitLoss | 65,259 us-gaap_ProfitLoss | 69,696 us-gaap_ProfitLoss | 63,792 us-gaap_ProfitLoss | 57,552 us-gaap_ProfitLoss | 284,608 us-gaap_ProfitLoss | 256,299 us-gaap_ProfitLoss | 212,619 us-gaap_ProfitLoss
Less: Net earnings attributable to noncontrolling interests | (422)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (496)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (919)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (765)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (992)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (573)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (699)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (974)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (2,602)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (3,238)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (3,181)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net earnings attributable to Kirby | $ 68,051 us-gaap_NetIncomeLoss | $ 76,717 us-gaap_NetIncomeLoss | $ 74,992 us-gaap_NetIncomeLoss | $ 62,246 us-gaap_NetIncomeLoss | $ 64,267 us-gaap_NetIncomeLoss | $ 69,123 us-gaap_NetIncomeLoss | $ 63,093 us-gaap_NetIncomeLoss | $ 56,578 us-gaap_NetIncomeLoss | $ 282,006 us-gaap_NetIncomeLoss | $ 253,061 us-gaap_NetIncomeLoss | $ 209,438 us-gaap_NetIncomeLoss
Net earnings per share attributable to Kirby common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.19 us-gaap_EarningsPerShareBasic | $ 1.34 us-gaap_EarningsPerShareBasic | $ 1.32 us-gaap_EarningsPerShareBasic | $ 1.09 us-gaap_EarningsPerShareBasic | $ 1.13 us-gaap_EarningsPerShareBasic | $ 1.22 us-gaap_EarningsPerShareBasic | $ 1.11 us-gaap_EarningsPerShareBasic | $ 1.00 us-gaap_EarningsPerShareBasic | $ 4.95 us-gaap_EarningsPerShareBasic | $ 4.46 us-gaap_EarningsPerShareBasic | $ 3.75 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 1.19 us-gaap_EarningsPerShareDiluted | $ 1.34 us-gaap_EarningsPerShareDiluted | $ 1.31 us-gaap_EarningsPerShareDiluted | $ 1.09 us-gaap_EarningsPerShareDiluted | $ 1.13 us-gaap_EarningsPerShareDiluted | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 1.11 us-gaap_EarningsPerShareDiluted | $ 1.00 us-gaap_EarningsPerShareDiluted | $ 4.93 us-gaap_EarningsPerShareDiluted | $ 4.44 us-gaap_EarningsPerShareDiluted | $ 3.73 us-gaap_EarningsPerShareDiluted

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