XML 48 R30.htm IDEA: XBRL DOCUMENT v2.4.0.8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, CAPITALIZED PRODUCT DEVELOPMENT AND DEBT ISSUANCE COSTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Capitalized Product Development Costs [Abstract]
Capitalized product development costs, net book value	$ 159		$ 159		$ 302
Amortization expense of capitalized product development costs	48	48	143	143
Debt Issuance Cost [Abstract]
Capitalized debt issuance costs	7,283		7,283		9,556
Amortization of debt issuance costs	$ 760	$ 763	$ 2,273	$ 1,235
Minimum [Member]
Capitalized Product Development Costs [Abstract]
Finite-Lived Intangible Asset, Useful Life			3 years
Maximum [Member]
Capitalized Product Development Costs [Abstract]
Finite-Lived Intangible Asset, Useful Life			5 years

X

- Definition

Aggregate amount of capitalized product development cost amortization recognized as expense during the period.

+ References

No definition available.

+ Details

Name:	csgp_AmortizationExpenseCapitalizedProductDevelopmentCosts
Namespace Prefix:	csgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	csgp_CapitalizedProductDevelopmentCostsAbstract
Namespace Prefix:	csgp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The net book value at balance sheet date.

+ References

No definition available.

+ Details

Name:	csgp_IntangibleAssetNetBookValue
Namespace Prefix:	csgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 8

-Article 9

+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- 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.

+ Details

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

X

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ 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 210.5-02.17)

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

+ Details

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant