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Employee Benefits (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Benefits [Abstract] |  |  |
Employer matching contribution percentage | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |  |
Maximum employer contribution amount of employee compensation | $ 1,500 ddd_MaximumEmployerContributionAmountOfEmployeeCompensation |  |
Employee benefit expenses | $ 721,000 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 527,000 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 489,000 us-gaap_DefinedBenefitPlanContributionsByEmployer

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- Definition Maximum Employer Contribution Amount Of Employee Compensation + References No definition available. + Details
Name: | ddd_MaximumEmployerContributionAmountOfEmployeeCompensation
Namespace Prefix: | ddd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration