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Acquisitions (Fiscal Year 2012 Acquisitions) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Nov. 26, 2014 | Apr. 02, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 03, 2012 | Dec. 31, 2011 | Apr. 05, 2012 | Apr. 10, 2012 | Apr. 17, 2012 | Apr. 17, 2012 | May 23, 2012 | Jul. 23, 2012 | Oct. 02, 2012 | Oct. 09, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Dec. 17, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the consideration paid |  | $ 69,026 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for business acquisition | 54,552 us-gaap_PaymentsToAcquireBusinessesGross | 51,526 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares paid for acquisition |  | 17,500 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 187,438 us-gaap_SalesRevenueNet | 166,944 us-gaap_SalesRevenueNet | 151,512 us-gaap_SalesRevenueNet | 147,758 us-gaap_SalesRevenueNet | 154,817 us-gaap_SalesRevenueNet | 135,717 us-gaap_SalesRevenueNet | 120,787 us-gaap_SalesRevenueNet | 102,079 us-gaap_SalesRevenueNet | 653,652 us-gaap_SalesRevenueNet | 513,400 us-gaap_SalesRevenueNet | 353,633 us-gaap_SalesRevenueNet |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  | 4,228 us-gaap_OperatingIncomeLoss | 8,208 us-gaap_OperatingIncomeLoss | 4,362 us-gaap_OperatingIncomeLoss | 9,517 us-gaap_OperatingIncomeLoss | 17,976 us-gaap_OperatingIncomeLoss | 28,570 us-gaap_OperatingIncomeLoss | 16,796 us-gaap_OperatingIncomeLoss | 17,519 us-gaap_OperatingIncomeLoss | 26,315 us-gaap_OperatingIncomeLoss | 80,861 us-gaap_OperatingIncomeLoss | 60,571 us-gaap_OperatingIncomeLoss |  |  |  |  |  |  |  |  |  |
Initial Lease Term [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Successive Lease Term [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Number of successive lease terms |  |  |  |  |  |  |  |  |  |  | 2 ddd_NumberOfSuccessiveLeaseTerms / us-gaap_StatementScenarioAxis = ddd_SuccessiveLeaseTermMember |  |  |  |  |  |  |  |  |  |  |  |
Z Corporation And Vidar Systems Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Jan. 03, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  |  |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,918 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 55,637 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 8,478 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  |  |  |  |  |  |  |  |  |
Pro forma revenue |  |  |  |  |  |  |  |  |  |  |  |  | 353,633 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  | 286,956 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  |  |  |  |  |  |  |
Pro forma net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 38,941 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  | 27,487 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = ddd_ZCorporationAndVidarSystemsCorporationMember |  |  |  |  |  |  |  |
Fresh Fiber B.V. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Apr. 05, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddd_FreshFiberBVMember |  |  |  |  |  |  |
Fair value of the consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,243 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddd_FreshFiberBVMember |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 848 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_FreshFiberBVMember |  |  |  |  |  |  |
Value of shares paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 395 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ddd_FreshFiberBVMember |  |  |  |  |  |  |
Time Period Of Earnout |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Kodama Studios, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Apr. 10, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddd_KodamaStudiosLlcMember |  |  |  |  |  |
Fair value of the consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,749 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddd_KodamaStudiosLlcMember |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,499 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_KodamaStudiosLlcMember |  |  |  |  |  |
Value of shares paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ddd_KodamaStudiosLlcMember |  |  |  |  |  |
Paramount Industries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Apr. 17, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,953 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddd_ParamountIndustriesMember |  |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,138 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_ParamountIndustriesMember |  |  |  |
Value of shares paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,815 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ddd_ParamountIndustriesMember |  |  |  |
Time Period Of Earnout |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Bespoke Innovations, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | May 23, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddd_BespokeInnovationsIncMember |  |  |
Fair value of the consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,903 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddd_BespokeInnovationsIncMember |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,064 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_BespokeInnovationsIncMember |  |  |
Value of shares paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,144 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ddd_BespokeInnovationsIncMember |  |  |
Maximum Deferred Payment Of Seller |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 695 ddd_MaximumDeferredPaymentOfSeller / us-gaap_BusinessAcquisitionAxis = ddd_BespokeInnovationsIncMember |  |  |
Viztu Technologies, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Jul. 23, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddd_ViztuTechnologiesIncMember |  |
Fair value of the consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddd_ViztuTechnologiesIncMember |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_ViztuTechnologiesIncMember |  |
Value of shares paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ddd_ViztuTechnologiesIncMember |  |
Maximum Earnout Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 ddd_MaximumEarnoutPayment / us-gaap_BusinessAcquisitionAxis = ddd_ViztuTechnologiesIncMember |  |
Business acquisition agreement, period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
TIM Innovative Modelmakers B.V. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddd_InnovativeModelmakersBVMember |
Fair value of the consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,714 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddd_InnovativeModelmakersBVMember |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,148 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_InnovativeModelmakersBVMember |
Value of shares paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 566 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ddd_InnovativeModelmakersBVMember |
INUS Technology, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  |  |  | Oct. 09, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddd_InusTechnologyIncMember
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,918 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ddd_InusTechnologyIncMember

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