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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($)
Statement of Cash Flows [Abstract] |
Cash and Restricted Cash Acquired From Acquisition | $ 46,432

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- 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