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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, 2023 | Dec. 31, 2022
Accounting Policies [Abstract] |  |
Beginning Balance | $ 52,830 | $ 35,802
Recognized during the period | 287,844 | 285,562
Reclassified to receivables | (258,792) | (265,707)
Other | 281 | (2,827)
Ending Balance | $ 82,163 | $ 52,830

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