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Intangible Assets (Intangible Assets Other Than Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Accumulated Amortization	$ (105,391)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	$ (97,121)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, Gross	398,872ddd_IntangibleAssetsGross	348,682ddd_IntangibleAssetsGross
Intangible assets, Net	293,481us-gaap_IntangibleAssetsNetExcludingGoodwill	251,561us-gaap_IntangibleAssetsNetExcludingGoodwill
Weighted average useful life	4 years
Trademarks [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	2,110us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember	2,110us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Licenses [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	5,875us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember	5,875us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Intangible assets with finite lives: Accumulated Amortization	(5,875)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember	(5,875)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Patent Costs [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	20,949us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	20,733us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Intangible assets with finite lives: Accumulated Amortization	(7,613)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	(7,369)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Intangible assets with finite lives: Net	13,336us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	13,364us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Weighted average useful life	3 years
Acquired Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	71,498us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_AcquiredTechnologyMember	57,383us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_AcquiredTechnologyMember
Intangible assets with finite lives: Accumulated Amortization	(20,687)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_AcquiredTechnologyMember	(18,241)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_AcquiredTechnologyMember
Intangible assets with finite lives: Net	50,811us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_AcquiredTechnologyMember	39,142us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_AcquiredTechnologyMember
Weighted average useful life	4 years
Internally Developed Software [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	9,072us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember	9,073us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember
Intangible assets with finite lives: Accumulated Amortization	(5,878)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember	(5,517)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember
Intangible assets with finite lives: Net	3,194us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember	3,556us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	185,497us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	157,139us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Intangible assets with finite lives: Accumulated Amortization	(39,163)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	(36,975)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Intangible assets with finite lives: Net	146,334us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	120,164us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Weighted average useful life	2 years
Non-Compete Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	35,114us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	35,469us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Intangible assets with finite lives: Accumulated Amortization	(12,637)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	(11,784)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Intangible assets with finite lives: Net	22,477us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	23,685us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Weighted average useful life	3 years
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	26,774us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	21,800us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Intangible assets with finite lives: Accumulated Amortization	(4,684)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	(4,455)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Intangible assets with finite lives: Net	22,090us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	17,345us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Weighted average useful life	5 years
Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	41,983us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	39,100us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Intangible assets with finite lives: Accumulated Amortization	(8,854)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	(6,905)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Intangible assets with finite lives: Net	$ 33,129us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	$ 32,195us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Weighted average useful life	1 year
Minimum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	1 year
Minimum [Member] | Patent Costs [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	5 years
Minimum [Member] | Acquired Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	3 years
Minimum [Member] | Internally Developed Software [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	1 year
Minimum [Member] | Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	3 years
Minimum [Member] | Non-Compete Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	3 years
Minimum [Member] | Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	2 years
Minimum [Member] | Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	4 years
Maximum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	20 years
Maximum [Member] | Patent Costs [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	20 years
Maximum [Member] | Acquired Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	10 years
Maximum [Member] | Internally Developed Software [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	8 years
Weighted average useful life	1 year
Maximum [Member] | Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	11 years
Maximum [Member] | Non-Compete Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	11 years
Maximum [Member] | Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	10 years
Maximum [Member] | Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	10 years

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Intangible assets, gross.

+ References

No definition available.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274



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