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International Retirement Plan (Assumptions Used To Determine Benefit Obligations) (Details) (International Retirement Plan [Member])
Dec. 31, 2014
Dec. 31, 2013
International Retirement Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 2.40%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
3.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
Rate of compensation 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
2.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember