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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED (Parenthetical) - USD ($) $ in Thousands | 9 Months Ended
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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