| Component: (Network and Table) | |
|---|---|
| Network | 2410402 - Disclosure - Accounts Payable and Accrued Expenses (Details) (http://www.regeneron.com/role/AccountsPayableAndAccruedExpensesDetails) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0000872589 (http://www.sec.gov/CIK) |
| Payables and Accruals [Abstract] | Period [Axis] | |
|---|---|---|
2012-12-31 | 2011-12-31 | |
Payables and Accruals [Abstract] | ||
Accounts Payable and Accrued Liabilities, Current [Abstract] | ||
Accounts payable | 38,934,000 | 27,736,000 |
Accrued payroll and related costs | 19,987,000 | 42,835,000 |
Accrued clinical trial expense | 10,985,000 | 9,850,000 |
Accrued sales-related deductions and royalties | 21,870,000 | 3,947,000 |
Other accrued expenses and liabilities | 19,569,000 | 11,257,000 |
Accounts payable and accrued expenses | 111,345,000 | 95,625,000 |