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Accounts Payable and Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accounts payable $ 90,601us-gaap_AccountsPayableTradeCurrent $ 99,508us-gaap_AccountsPayableTradeCurrent
Accrued payroll and related costs 64,112us-gaap_EmployeeRelatedLiabilitiesCurrent 92,778us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued clinical trial expense 44,659regn_AccruedClinicalTrialExpenseCurrent 41,555regn_AccruedClinicalTrialExpenseCurrent
Accrued sales-related charges, deductions and royalties 165,511regn_Accruedsalesrelatedchargesdeductionsandroyalties 133,085regn_Accruedsalesrelatedchargesdeductionsandroyalties
Other accrued expenses and liabilities 97,879us-gaap_OtherAccruedLiabilitiesCurrent 116,563us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses $ 462,762us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 483,489us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent