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Summary of Significant Accounting Policies - Rollforward of Unbilled Accounts Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounting Policies [Abstract] |  |
Beginning Balance | $ 82,163 | $ 52,830
Recognized during the period | 267,879 | 287,844
Reclassified to receivables | (268,855) | (258,792)
Other | (1,014) | 281
Ending Balance | $ 80,173 | $ 82,163

X
- Definition Other unbilled receivables. + References No definition available. + Details
Name: | csgs_OtherUnbilledReceivables
Namespace Prefix: | csgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unbilled receivables reclassified to recievables. + References No definition available. + Details
Name: | csgs_UnbilledReceivablesReclassifiedToRecievables
Namespace Prefix: | csgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unbilled receivables recognized during period. + References No definition available. + Details
Name: | csgs_UnbilledReceivablesRecognizedDuringPeriod
Namespace Prefix: | csgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant