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Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Components of restructuring expenses and reserve    
Employee severance, benefits and related costs $ 2,023us-gaap_SeveranceCosts1  
Payments (70)us-gaap_PaymentsForRestructuring  
Accrued restructuring, end of period 1,953us-gaap_RestructuringReserve  
Charges 2,023us-gaap_RestructuringCharges 2,215us-gaap_RestructuringCharges
Lumara Health Inc Member    
Components of restructuring expenses and reserve    
Charges $ 2,000us-gaap_RestructuringCharges
/ us-gaap_BusinessAcquisitionAxis
= amag_LumaraHealthIncMember