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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Statement of Cash Flows [Abstract]
Cash and settlement assets acquired	$ 0	$ 46,432

X

- Definition

The cash and restricted cash/settlement assets associated with the acquisition of a business during the period.

+ References

No definition available.

+ Details

Name:	csgs_CashAndRestrictedCashAcquiredFromAcquisition
Namespace Prefix:	csgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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