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Fair Value Measurements (Narrative) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Fair Value Disclosures [Abstract] |
Deferred purchase payment provision | $ 2,675
Earnout accretion | $ 115

X
- Definition Business Combination, Continegent Consideration, Earnout Accretion + References No definition available. + Details
Name: | ddd_BusinessCombinationContinegentConsiderationEarnoutAccretion
Namespace Prefix: | ddd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred Purchase Payment Provision + References No definition available. + Details
Name: | ddd_DeferredPurchasePaymentProvision
Namespace Prefix: | ddd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration