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Subsequent Event (Details) (Subsequent Event [Member], Wuxi Easyway [Member])
3 Months Ended
Mar. 31, 2015
Apr. 02, 2015
Subsequent Event [Member] | Wuxi Easyway [Member]
   
Subsequent Event [Line Items]    
Business acquisition, ownership percentage   65.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddd_WuxiEasywayMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent event date Apr. 02, 2015