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Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Accounts Receivable, Net    
Net Accounts receivable 56,176us-gaap_AccountsReceivableNetCurrent 38,172us-gaap_AccountsReceivableNetCurrent
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Amerisource Bergen Drug Corporation    
Customers representing greater than 10% of accounts receivable balances    
Accounts receivable by major customer (as a percent) 51.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember		 45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
Accounts Receivable [Member] | Credit Concentration Risk [Member] | McKesson Corporation    
Customers representing greater than 10% of accounts receivable balances    
Accounts receivable by major customer (as a percent)   12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
Accounts Receivable [Member] | Credit Concentration Risk [Member] | McKesson Corporation | 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_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Cardinal Health Inc    
Customers representing greater than 10% of accounts receivable balances    
Accounts receivable by major customer (as a percent)   10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Cardinal Health Inc | 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_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember