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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
	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	$ 668,297us-gaap_Revenues	$ 680,721us-gaap_Revenues	$ 628,054us-gaap_Revenues	$ 589,246us-gaap_Revenues	$ 568,397us-gaap_Revenues	$ 551,105us-gaap_Revenues	$ 563,908us-gaap_Revenues	$ 558,785us-gaap_Revenues	$ 2,566,318us-gaap_Revenues	$ 2,242,195us-gaap_Revenues	$ 2,112,658us-gaap_Revenues
Costs and expenses	554,646us-gaap_CostsAndExpenses	552,642us-gaap_CostsAndExpenses	501,556us-gaap_CostsAndExpenses	482,443us-gaap_CostsAndExpenses	459,813us-gaap_CostsAndExpenses	432,991us-gaap_CostsAndExpenses	455,193us-gaap_CostsAndExpenses	458,904us-gaap_CostsAndExpenses	2,090,506us-gaap_CostsAndExpenses	1,806,013us-gaap_CostsAndExpenses	1,747,825us-gaap_CostsAndExpenses
Gain (loss) on disposition of assets	156us-gaap_GainLossOnDispositionOfAssets	47us-gaap_GainLossOnDispositionOfAssets	527us-gaap_GainLossOnDispositionOfAssets	51us-gaap_GainLossOnDispositionOfAssets	160us-gaap_GainLossOnDispositionOfAssets	223us-gaap_GainLossOnDispositionOfAssets	537us-gaap_GainLossOnDispositionOfAssets	(32)us-gaap_GainLossOnDispositionOfAssets	781us-gaap_GainLossOnDispositionOfAssets	888us-gaap_GainLossOnDispositionOfAssets	(14)us-gaap_GainLossOnDispositionOfAssets
Operating income	113,807us-gaap_OperatingIncomeLoss	128,126us-gaap_OperatingIncomeLoss	127,025us-gaap_OperatingIncomeLoss	106,854us-gaap_OperatingIncomeLoss	108,744us-gaap_OperatingIncomeLoss	118,337us-gaap_OperatingIncomeLoss	109,252us-gaap_OperatingIncomeLoss	99,849us-gaap_OperatingIncomeLoss	475,812us-gaap_OperatingIncomeLoss	436,182us-gaap_OperatingIncomeLoss	364,833us-gaap_OperatingIncomeLoss
Other income (expense)	125us-gaap_NonoperatingIncomeExpense	27us-gaap_NonoperatingIncomeExpense	123us-gaap_NonoperatingIncomeExpense	(236)us-gaap_NonoperatingIncomeExpense	132us-gaap_NonoperatingIncomeExpense	60us-gaap_NonoperatingIncomeExpense	101us-gaap_NonoperatingIncomeExpense	75us-gaap_NonoperatingIncomeExpense	(345)us-gaap_NonoperatingIncomeExpense	20us-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	108,783us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	122,928us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	121,679us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	101,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	102,905us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	111,703us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	102,134us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	91,936us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	454,390us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	408,678us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	340,526us-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	68,473us-gaap_ProfitLoss	77,213us-gaap_ProfitLoss	75,911us-gaap_ProfitLoss	63,011us-gaap_ProfitLoss	65,259us-gaap_ProfitLoss	69,696us-gaap_ProfitLoss	63,792us-gaap_ProfitLoss	57,552us-gaap_ProfitLoss	284,608us-gaap_ProfitLoss	256,299us-gaap_ProfitLoss	212,619us-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	$ 68,051us-gaap_NetIncomeLoss	$ 76,717us-gaap_NetIncomeLoss	$ 74,992us-gaap_NetIncomeLoss	$ 62,246us-gaap_NetIncomeLoss	$ 64,267us-gaap_NetIncomeLoss	$ 69,123us-gaap_NetIncomeLoss	$ 63,093us-gaap_NetIncomeLoss	$ 56,578us-gaap_NetIncomeLoss	$ 282,006us-gaap_NetIncomeLoss	$ 253,061us-gaap_NetIncomeLoss	$ 209,438us-gaap_NetIncomeLoss
Net earnings per share attributable to Kirby common stockholders [Abstract]
Basic (in dollars per share)	$ 1.19us-gaap_EarningsPerShareBasic	$ 1.34us-gaap_EarningsPerShareBasic	$ 1.32us-gaap_EarningsPerShareBasic	$ 1.09us-gaap_EarningsPerShareBasic	$ 1.13us-gaap_EarningsPerShareBasic	$ 1.22us-gaap_EarningsPerShareBasic	$ 1.11us-gaap_EarningsPerShareBasic	$ 1.00us-gaap_EarningsPerShareBasic	$ 4.95us-gaap_EarningsPerShareBasic	$ 4.46us-gaap_EarningsPerShareBasic	$ 3.75us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.19us-gaap_EarningsPerShareDiluted	$ 1.34us-gaap_EarningsPerShareDiluted	$ 1.31us-gaap_EarningsPerShareDiluted	$ 1.09us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted	$ 1.21us-gaap_EarningsPerShareDiluted	$ 1.11us-gaap_EarningsPerShareDiluted	$ 1.00us-gaap_EarningsPerShareDiluted	$ 4.93us-gaap_EarningsPerShareDiluted	$ 4.44us-gaap_EarningsPerShareDiluted	$ 3.73us-gaap_EarningsPerShareDiluted

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