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Convertible Senior Notes (Liability Component) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Jan. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Principal $ 275,000,000us-gaap_DebtInstrumentFaceAmount   $ 275,000,000us-gaap_DebtInstrumentFaceAmount
Less: Debt discount, net (25,571,000)us-gaap_DebtInstrumentUnamortizedDiscount [1]   (28,324,000)us-gaap_DebtInstrumentUnamortizedDiscount [1]
Net carrying amount 249,429,000us-gaap_DebtInstrumentCarryingAmount   246,676,000us-gaap_DebtInstrumentCarryingAmount
Senior Notes [Member] | Convertible Senior Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Principal 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Less: Debt discount, net (86,704,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [2]   0us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [2]
Net carrying amount 313,296,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		   0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Fair value of Notes $ 335,200,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= mdco_ConvertibleSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Remaining contractual life 6 years 9 months 18 days    
[1] Included in the consolidated balance sheets within convertible senior notes (due 2017) and amortized to interest expense over the remaining life of the 2017 Notes using the effective interest rate method.
[2] Included in the consolidated balance sheets within convertible senior notes (due 2022) and amortized to interest expense over the remaining life of the 2022 Notes using the effective interest rate method.