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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, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |
Beginning Balance | $ 37,785 | $ 33,450
Recognized during the period | 252,661 | 248,574
Reclassified to receivables | (254,482) | (244,574)
Other | (162) | 335
Ending Balance | $ 35,802 | $ 37,785

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