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STOCK AWARD PLANS (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
STOCK AWARD PLANS [Abstract] |  |
Compensation cost | $ 2,538,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,153,000 us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit | 949,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 816,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share based Compensation Plans Combined Disclosure [Abstract] |  |
Intrinsic value of stock options exercised | 68,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 6,102,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Tax benefit from stock options exercised | 26,000 us-gaap_DeferredTaxExpenseFromStockOptionsExercised | 2,313,000 us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Intrinsic value of restricted stock vesting | 8,986,000 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalIntrinsicValue | 13,916,000 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalIntrinsicValue
Tax benefit from restricted stock vesting | 3,361,000 kex_TaxBenefitFromRestrictedStockVesting | 5,274,000 kex_TaxBenefitFromRestrictedStockVesting
Fair value of options vested | 2,167,000 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue | 2,076,000 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue
Fair value of restricted stock vested | 8,986,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | 13,916,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Fair value of stock options granted (in dollars per share) | $ 25.18 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageFairValue | $ 34.20 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageFairValue
Fair value of stock options granted | 2,893,000 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue | 2,503,000 kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue
Fair Value Assumptions [Abstract] |  |
Dividend yield (in hundredths) | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Average risk-free interest rate (in hundredths) | 1.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Stock price volatility (in hundredths) | 33.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | 33.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Estimated option term | 6 years | 6 years
Employee Stock Award Plan [Member] |  |
Stock Award Plan Information [Abstract] |  |
Shares available for future grants (in shares) | 2,304,182 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward] |  |
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares) | 322,956 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares) | 114,894 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares) | 437,850 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Weighted Average Exercise Price [Abstract] |  |
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share) | $ 69.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Granted, Weighted Average Exercise Price (in dollars per share) | $ 74.99 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share) | $ 71.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Unvested Restricted Stock Award Shares [Roll Forward] |  |
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares) | 321,453 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Granted, Unvested Restricted Stock Award Shares (in shares) | 121,870 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Vested, Unvested Restricted Stock Award Shares (in shares) | (113,383)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares) | 329,940 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Weighted Average Grant Date Fair Value Per Share [Abstract] |  |
Nonvested balance beginning of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 71.04 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 75.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 60.72 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 76.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = kex_EmployeePlanMember |
Employee Stock Award Plan [Member] | First Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 36.35 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 31.35 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 16,910 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 1 year 10 months 24 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 32.82 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 16,910 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 32.82 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Employee Stock Award Plan [Member] | Second Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, lower limit (in dollars per share) | $ 46.74 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 56,629 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 2 years 9 months 18 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 46.74 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 56,629 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 46.74 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Employee Stock Award Plan [Member] | Third Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 74.99 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 65.28 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 287,140 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 3 years 9 months 18 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 71.03 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 141,669 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 67.90 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Employee Stock Award Plan [Member] | Fourth Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 96.85 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 86.96 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 37,730 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 5 years 9 months 18 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 93.89 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 12,576 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 93.89 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Employee Stock Award Plan [Member] | Fifth Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 114.11 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 101.46 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 39,441 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 5 years 10 months 24 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 103.12 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 12,476 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 102.53 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Employee Stock Award Plan [Member] | Full Exercise Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 114.11 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 31.35 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 437,850 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 4 years |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 71.27 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Aggregate Intrinsic Value, Options Outstanding | 3,472,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 240,260 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 63.60 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Aggregate Intrinsic Value, Options Exercisable | 3,330,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_PlanNameAxis = kex_EmployeePlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
2000 Director Plan [Member] |  |
Stock Award Plan Information [Abstract] |  |
Term of grant | 10 years |
Vesting period | 6 months |
Shares available for future grants (in shares) | 559,881 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward] |  |
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares) | 298,334 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares) | (6,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares) | 292,334 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Weighted Average Exercise Price [Abstract] |  |
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share) | $ 60.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Exercised, Weighted Average Exercise Price (in dollars per share) | $ 62.48 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share) | $ 59.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Unvested Restricted Stock Award Shares [Roll Forward] |  |
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares) | 292 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Vested, Unvested Restricted Stock Award Shares (in shares) | (292)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Weighted Average Grant Date Fair Value Per Share [Abstract] |  |
Nonvested balance beginning of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 99.52 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 99.52 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = kex_DirectorPlanMember |
2000 Director Plan [Member] | First Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 29.60 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 20.28 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 30,000 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 1 year 8 months 12 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 25.87 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 30,000 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 25.87 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FirstPriceRangeMember |
2000 Director Plan [Member] | Second Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 36.82 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 35.17 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 32,048 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 1 year |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 36.09 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 32,048 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 36.09 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_SecondPriceRangeMember |
2000 Director Plan [Member] | Third Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 56.45 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 41.24 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 91,022 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 4 years |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 51.87 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 91,022 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 51.87 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_ThirdPriceRangeMember |
2000 Director Plan [Member] | Fourth Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 62.48 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 61.89 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 48,306 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 6 years 2 months 12 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 62.36 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 48,306 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 62.36 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FourthPriceRangeMember |
2000 Director Plan [Member] | Fifth Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 99.52 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 75.17 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 90,958 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 6 years 10 months 24 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 86.41 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 90,958 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 86.41 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_FifthPriceRangeMember |
2000 Director Plan [Member] | Full Exercise Price Range [Member] |  |
Outstanding and Exercisable Stock options [Abstract] |  |
Range of Exercise Prices, upper limit (in dollars per share) | $ 99.52 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Range of Exercise Prices, lower limit (in dollars per share) | $ 20.28 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Options Outstanding [Abstract] |  |
Number Outstanding (in shares) | 292,334 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Weighted Average Remaining Contractual Life (in years) | 4 years 8 months 12 days |
Weighted Average Exercise Price, Options Outstanding (in dollars per share) | $ 59.95 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Aggregate Intrinsic Value, Options Outstanding | 5,446,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Options Exercisable [Abstract] |  |
Number Exercisable (in shares) | 292,334 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 59.95 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Aggregate Intrinsic Value, Options Exercisable | 5,446,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_PlanNameAxis = kex_DirectorPlanMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = kex_TotalExercisePriceRangeMember |
Employee Stock Award Plan - Options Granted After to January 25, 2010 [Member] |  |
Stock Award Plan Information [Abstract] |  |
Term of grant | 7 years |
Vesting period | 3 years |
Stock Options [Member] |  |
Share based Compensation Plans Combined Disclosure [Abstract] |  |
Unrecognized compensation cost related to unvested awards | 4,981,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Weighted average period of recognition in years | 2 years |
Restricted Stock [Member] |  |
Share based Compensation Plans Combined Disclosure [Abstract] |  |
Unrecognized compensation cost related to unvested awards | $ 23,486,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Weighted average period of recognition in years | 3 years 6 months |

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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