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Acquisitions (Fiscal Year 2014 Acquisitions) (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended
Nov. 26, 2014
Apr. 02, 2014
Dec. 31, 2014
Feb. 18, 2014
Aug. 06, 2014
Aug. 13, 2014
Aug. 28, 2014
Sep. 03, 2014
Dec. 16, 2014
Feb. 09, 2015
Nov. 25, 2014
Business Acquisition [Line Items]                      
Date of acquisition     Dec. 17, 2014                
Fair value of the consideration paid   $ 69,026us-gaap_BusinessCombinationConsiderationTransferred1                  
Cash paid for business acquisition 54,552us-gaap_PaymentsToAcquireBusinessesGross 51,526us-gaap_PaymentsToAcquireBusinessesGross                  
Value of shares paid for acquisition   17,500us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable                  
Digital PlaySpace, Inc. [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Feb. 18, 2014                
Fair value of the consideration paid       4,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ddd_DigitalPlayspaceIncMember
             
Cash paid for business acquisition       2,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ddd_DigitalPlayspaceIncMember
             
Value of shares paid for acquisition       2,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ddd_DigitalPlayspaceIncMember
             
Medical Modeling Inc. [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Apr. 02, 2014                
Business acquisition, ownership percentage   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddd_MedicalModelingIncMember
                 
Laser Reproductions [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Aug. 06, 2014                
Fair value of the consideration paid         17,450us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ddd_LaserReproductionsMember
           
Cash paid for business acquisition         13,075us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ddd_LaserReproductionsMember
           
Value of shares paid for acquisition         4,375us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ddd_LaserReproductionsMember
           
American Precision Machining And American Precision Prototyping, LLC [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Aug. 13, 2014                
Cash paid for business acquisition           14,089us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ddd_AmericanPrecisionMachiningAndAmericanPrecisionPrototypingLlcMember
         
Simbionix USA Corporation [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Aug. 28, 2014                
Cash paid for business acquisition             121,562us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ddd_SimbionixCorporationMember
       
Business acquisition, ownership percentage             100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddd_SimbionixCorporationMember
       
LayerWise NV [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Sep. 03, 2014                
Cash paid for business acquisition               41,933us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ddd_LayerwiseNvMember
     
Business acquisition, ownership percentage               100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddd_LayerwiseNvMember
     
Robtec [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Nov. 25, 2014                
Cash paid for business acquisition 21,880us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ddd_RobtecMember
                   
Business acquisition, ownership percentage                     70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddd_RobtecMember
botObjects Ltd [Member]                      
Business Acquisition [Line Items]                      
Date of acquisition     Dec. 16, 2014                
Cash paid for business acquisition                 24,743us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ddd_BotobjectsLtdMember
   
Business acquisition, ownership percentage                 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddd_BotobjectsLtdMember
   
Right to earn additional pursuant                 3 years    
Subsequent Event [Member] | Cimatron [Member]                      
Business Acquisition [Line Items]                      
Fair value of the consideration paid                   77,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ddd_CimatronMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Maximum [Member] | botObjects Ltd [Member] | Forecast [Member]                      
Business Acquisition [Line Items]                      
Long term earnouts related to acquisitions                 $ 25,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= ddd_BotobjectsLtdMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember