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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interests [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of year at Dec. 31, 2011 | $ 5,928,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 357,294,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (56,176,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,229,641,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (94,162,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 11,633,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Issuance of shares in acquisition | 50,000 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 29,030,000 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 6,716,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Tax benefit realized from equity compensation plans |  | 3,212,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 3,212,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |
Issuance of restricted stock, net of forfeitures |  | (8,263,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Amortization of unearned compensation |  | 9,796,000 kex_AmortizationOfUnearnedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Net earnings attributable to Kirby for the year |  |  |  | 209,438,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 209,438,000 us-gaap_NetIncomeLoss |
Purchase of treasury stock (187,000 in 2014) |  |  |  |  | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (211,000 in 2014, 261,000 in 2013 and 341,000 in 2012) |  |  |  |  | 7,415,000 kex_CostOfTreasuryStockIssuedUponExerciseOfStockOptionsAndIssuanceOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 3,181,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (3,181,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Return of investment to noncontrolling interests |  |  |  |  |  | (2,728,000)us-gaap_PaymentsToMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 2,728,000 us-gaap_PaymentsToMinorityShareholders |
Other comprehensive income (loss), net of taxes |  |  | (4,951,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | (4,951,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax | [1]
Balance at end of year at Dec. 31, 2012 | 5,978,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 397,785,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (61,127,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,439,079,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (86,747,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 12,086,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Issuance of shares in acquisition | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 8,276,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Tax benefit realized from equity compensation plans |  | 3,001,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 3,001,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |
Issuance of restricted stock, net of forfeitures |  | (10,068,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Amortization of unearned compensation |  | 11,621,000 kex_AmortizationOfUnearnedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Net earnings attributable to Kirby for the year |  |  |  | 253,061,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 253,061,000 us-gaap_NetIncomeLoss |
Purchase of treasury stock (187,000 in 2014) |  |  |  |  | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (211,000 in 2014, 261,000 in 2013 and 341,000 in 2012) |  |  |  |  | 5,493,000 kex_CostOfTreasuryStockIssuedUponExerciseOfStockOptionsAndIssuanceOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 3,238,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (3,238,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Return of investment to noncontrolling interests |  |  |  |  |  | (3,857,000)us-gaap_PaymentsToMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,857,000 us-gaap_PaymentsToMinorityShareholders |
Other comprehensive income (loss), net of taxes |  |  | 44,334,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | 44,334,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax | [1]
Balance at end of year at Dec. 31, 2013 | 5,978,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 410,615,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (16,793,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,692,140,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (81,254,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 11,467,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 2,022,153,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
Issuance of shares in acquisition | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 8,345,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Tax benefit realized from equity compensation plans |  | 6,119,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 6,119,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |
Issuance of restricted stock, net of forfeitures |  | (8,195,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Amortization of unearned compensation |  | 11,591,000 kex_AmortizationOfUnearnedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Net earnings attributable to Kirby for the year |  |  |  | 282,006,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 282,006,000 us-gaap_NetIncomeLoss |
Purchase of treasury stock (187,000 in 2014) |  |  |  |  | (15,321,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (211,000 in 2014, 261,000 in 2013 and 341,000 in 2012) |  |  |  |  | 3,049,000 kex_CostOfTreasuryStockIssuedUponExerciseOfStockOptionsAndIssuanceOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 2,602,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (2,602,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Return of investment to noncontrolling interests |  |  |  |  |  | (3,192,000)us-gaap_PaymentsToMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,192,000 us-gaap_PaymentsToMinorityShareholders |
Other comprehensive income (loss), net of taxes |  |  | (44,244,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | (44,244,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax | [1]
Balance at end of year at Dec. 31, 2014 | $ 5,978,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 428,475,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (61,037,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,974,146,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (93,526,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 10,877,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 2,264,913,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
[1] | (b) Reclassifications to net earnings of derivatives qualifying as effective hedges are recognized in interest expense or costs of sales and operating expenses as appropriate. (See Note 4 Derivative Instruments)

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