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Fair Value Measurement (Foreign Currency Forward Contracts) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Asset   $ 1,027,000us-gaap_DerivativeLiabilityFairValueGrossAsset  
Derivative Liability, Fair Value, Gross Liability   (3,250,000)us-gaap_DerivativeFairValueOfDerivativeLiability  
Gains (losses) on intercompany receivables (500,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (800,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 800,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Fair value, assets (liabilities), net 5,179,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet (2,223,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet  
Derivative Asset, Fair Value, Gross Asset 6,211,000us-gaap_DerivativeFairValueOfDerivativeAsset    
Derivative Asset, Fair Value, Gross Liability (1,032,000)us-gaap_DerivativeAssetFairValueGrossLiability    
Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Forward contracts not designated as hedging instruments net realized gains (losses) (200,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
(300,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
(2,100,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Asset   975,000us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Derivative Liability, Fair Value, Gross Liability   (3,172,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Fair value, assets (liabilities), net   (2,197,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]      
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Fair value, assets (liabilities), net 5,196,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Derivative Asset, Fair Value, Gross Asset 6,167,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Derivative Asset, Fair Value, Gross Liability (971,000)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Notional amount of cash flow hedges 35,500,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]      
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Asset   52,000us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Derivative Liability, Fair Value, Gross Liability   (78,000)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Fair value, assets (liabilities), net   (26,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]      
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]      
Fair value, assets (liabilities), net (17,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Derivative Asset, Fair Value, Gross Asset 44,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Derivative Asset, Fair Value, Gross Liability (61,000)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member]      
Derivative [Line Items]      
Notional amount of cash flow hedges 109,900,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
   
Cash flow hedges realized gains (losses) 600,000cnmd_CashFlowHedgeGainLossReclassifiedToNetSalesOrCostOfSalesNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
200,000cnmd_CashFlowHedgeGainLossReclassifiedToNetSalesOrCostOfSalesNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
3,800,000cnmd_CashFlowHedgeGainLossReclassifiedToNetSalesOrCostOfSalesNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Unrealized gain (loss) on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in next fiscal year $ 3,300,000us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember