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Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accounts Receivable, Net    
Net Accounts receivable 38,172us-gaap_AccountsReceivableNetCurrent 6,842us-gaap_AccountsReceivableNetCurrent
Amerisource Bergen Drug Corporation [Member]    
Customers representing greater than 10% of accounts receivable balances    
Accounts receivable by major customer (as a percent) 45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember		 43.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
McKesson Corporation [Member]    
Customers representing greater than 10% of accounts receivable balances    
Accounts receivable by major customer (as a percent) 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember		 29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
Cardinal Health Inc [Member]    
Customers representing greater than 10% of accounts receivable balances    
Accounts receivable by major customer (as a percent)   19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
Cardinal Health Inc [Member] | Maximum    
Customers representing greater than 10% of accounts receivable balances    
Accounts receivable by major customer (as a percent) 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember