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Accounts Payable and Accrued Expenses (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accounts payable $ 99,508,000us-gaap_AccountsPayableTradeCurrent $ 61,936,000us-gaap_AccountsPayableTradeCurrent
Accrued payroll and related costs 92,778,000us-gaap_EmployeeRelatedLiabilitiesCurrent 69,429,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued clinical trial expense 41,555,000regn_AccruedClinicalTrialExpenseCurrent 23,654,000regn_AccruedClinicalTrialExpenseCurrent
Accrued sales-related charges, deductions and royalties 133,085,000regn_Accruedsalesrelatedchargesdeductionsandroyalties 66,855,000regn_Accruedsalesrelatedchargesdeductionsandroyalties
Other accrued expenses and liabilities 117,302,000us-gaap_OtherAccruedLiabilitiesCurrent 29,022,000us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses 484,228,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 250,896,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Warrant Transactions    
Payables and Accruals [Abstract]    
Accounts Payable, Other $ 59,800,000us-gaap_AccountsPayableOtherCurrentAndNoncurrent
/ us-gaap_ClassOfWarrantOrRightAxis
= regn_WarrantTransactionsMember