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Shareholders' Equity (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 28, 2013
Feb. 29, 2012
Dec. 31, 2014
plans
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividends per share of common stock $ 0.20us-gaap_CommonStockDividendsPerShareDeclared $ 0.15us-gaap_CommonStockDividendsPerShareDeclared $ 0.80us-gaap_CommonStockDividendsPerShareDeclared $ 0.65us-gaap_CommonStockDividendsPerShareDeclared $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
Dividends payable     $ 5,510,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 5,545,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 4,256,000us-gaap_DividendsPayableCurrentAndNoncurrent
Preferred stock, shares authorized     500,000us-gaap_PreferredStockSharesAuthorized 500,000us-gaap_PreferredStockSharesAuthorized  
Preferred stock, par value (per share)     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare  
Shares authorized under repurchase program     200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1    
Total stock repurchased under plan, shares     6,100,000cnmd_StockRepurchaseProgramNumberOfSharesRepurchasedToDateShares    
Total stock repurchased under plan, value     162,600,000cnmd_StockRepurchaseProgramNumberOfSharesRepurchasedToDateValue    
Remaining authorized repurchase amount     37,400,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1    
Number of share repurchased     400,000us-gaap_TreasuryStockSharesAcquired 1,600,000us-gaap_TreasuryStockSharesAcquired 100,000us-gaap_TreasuryStockSharesAcquired
Repurchase of treasury stock     16,862,000us-gaap_TreasuryStockValueAcquiredCostMethod 50,556,000us-gaap_TreasuryStockValueAcquiredCostMethod 3,923,000us-gaap_TreasuryStockValueAcquiredCostMethod
Number of shares reserved for share-based compensation plans     6,800,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance    
Number of share-based compensation plans     3cnmd_NumberOfShareBasedCompensationPlans    
Number of shares available for grant     1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Vesting term     5 years    
Stock-based compensation     9,330,000us-gaap_ShareBasedCompensation 5,593,000us-gaap_ShareBasedCompensation 5,653,000us-gaap_ShareBasedCompensation
Tax benefit from stock-based compensation     3,400,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2,100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2,100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Proceeds from stock options exercised     1,800,000us-gaap_ProceedsFromStockOptionsExercised 16,700,000us-gaap_ProceedsFromStockOptionsExercised 9,600,000us-gaap_ProceedsFromStockOptionsExercised
Stock Options and Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration from date of grant     10 years    
Other Expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     $ 3,900,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember