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LONG-TERM DEBT, COVENANT CALCULATIONS (Details)	Apr. 01, 2014
Debt Disclosure [Abstract]
Maximum first lien secured leverage ratio after eight fiscal quarters after closing date (in percent)	350.00%
Maximum total leverage ratio after eight fiscal quarters after closing date (in percent)	450.00%

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- Definition

Maximum total leverage ratio after eight fiscal quarters

+ References

No definition available.

+ Details

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- Definition

Maximum first lien secured leverage ratio after eight quarters after closing date.

+ References

No definition available.

+ Details

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Namespace Prefix:	csgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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