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Acquisitions (ProFibrix B.V.) (Details) (USD $)
9 Months Ended 0 Months Ended
Sep. 30, 2013
Aug. 05, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Business Acquisition [Line Items]            
Escrow deposit   $ 9,000,000us-gaap_EscrowDeposit        
Assets Acquired:            
Goodwill     286,532,000us-gaap_Goodwill 257,694,000us-gaap_Goodwill 14,671,000us-gaap_Goodwill  
ProFibrix [Member]            
Business Acquisition [Line Items]            
Option payments           10,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
Contingent consideration   140,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Acquisition related costs 3,100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
         
Estimated Purchase Price            
Upfront cash consideration   105,395,000us-gaap_BusinessCombinationContingentConsiderationAsset
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Fair value of contingent purchase price   82,550,000mdco_BusinessCombinationContingentConsiderationAssetFairValue
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Total purchase price   187,945,000mdco_BusinessCombinationPreliminaryEstimatedPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Assets Acquired:            
Cash   7,880,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Prepaid assets   528,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Fixed assets, net   124,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
In-process research and development   176,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Goodwill   52,037,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Total Assets   236,569,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Liabilities Assumed:            
Accounts payable   1,074,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Accrued expenses   3,544,000mdco_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesAccruedExpense
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Contingent purchase price   82,550,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Deferred tax liabilities   44,006,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Total Liabilities   131,174,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
Total purchase price   105,395,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
       
ProFibrix [Member] | License Agreement Terms [Member]            
Business Acquisition [Line Items]            
Agreed payments to acquire intangible assets   $ 90,900,000mdco_AgreedPaymentstoAcquireIntangibleAssetsMaximum
/ us-gaap_BusinessAcquisitionAxis
= mdco_ProFibrixMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicenseAgreementTermsMember