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Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Dec. 31, 2014 item	Sep. 30, 2014	Oct. 10, 2014
Base Rate [Member]
Subsequent Event [Line Items]
Variable basis spread	0.50%
LIBOR [Member]
Subsequent Event [Line Items]
Variable basis spread	1.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent event date		Oct. 10, 2014
Revolving credit facility, borrowing capacity			$ 150,000
Length of revolving credit facility, in years	5 years
Addtional borrowing capacity	$ 75,000
Consolidated total funded indebtedness to consolidated EBITDA ratio	3.00
Consolidated EBITDA to cash interest expense ratio	3.50
Subsequent Event [Member] | Minimum [Member]
Subsequent Event [Line Items]
Quarterly commitment fee percentage	0.20%
Subsequent Event [Member] | Maximum [Member]
Subsequent Event [Line Items]
Quarterly commitment fee percentage	0.25%
Subsequent Event [Member] | Base Rate [Member] | Minimum [Member]
Subsequent Event [Line Items]
Variable basis spread	0.25%
Subsequent Event [Member] | Base Rate [Member] | Maximum [Member]
Subsequent Event [Line Items]
Variable basis spread	0.50%
Subsequent Event [Member] | LIBOR [Member] | Minimum [Member]
Subsequent Event [Line Items]
Variable basis spread	1.25%
Subsequent Event [Member] | LIBOR [Member] | Maximum [Member]
Subsequent Event [Line Items]
Variable basis spread	1.50%

X

- Definition

Consolidated EBITDA to cash interest expense ratio.

+ References

No definition available.

+ Details

Name:	ddd_ConsolidatedEbitdaToCashInterestExpenseRatio
Namespace Prefix:	ddd_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Consolidated total funded indebtedness to consolidated EBITDA ratio.

+ References

No definition available.

+ Details

Name:	ddd_ConsolidatedTotalFundedIndebtednessToConsolidatedEbitdaRatio
Namespace Prefix:	ddd_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Additonal borrowing capacity under the credit facility with certain terms and conditions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	ddd_LineOfCreditFacilityAddtionalBorrowingCapacity
Namespace Prefix:	ddd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration