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Summary of Significant Accounting Policies - Schedule of Settlement and Merchant Reserve Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
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Settlement And Merchant Reserve Assets And Liabilities [Abstract] |  |  |
Settlement assets | $ 291,976 | $ 330,769 |
Merchant reserve assets | 9,569 | 12,466 |
Total | 301,545 | 343,235 | $ 240,755
Settlement liabilities | 288,889 | 329,458 |
Merchant reserve liabilities | 9,530 | 12,466 |
Total | $ 298,419 | $ 341,924 |

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- Definition Merchant reserve assets current. + References No definition available. + Details
Name: | csgs_MerchantReserveAssetsCurrent
Namespace Prefix: | csgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Merchant reserve liabilities current. + References No definition available. + Details
Name: | csgs_MerchantReserveLiabilitiesCurrent
Namespace Prefix: | csgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Settlement And Merchant Reserve Assets And Liabilities Abstract + References No definition available. + Details
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Namespace Prefix: | csgs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Settlement and merchant reserve assets current. + References No definition available. + Details
Name: | csgs_SettlementAndMerchantReserveAssetsCurrent
Namespace Prefix: | csgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement and merchant reserve liabilities current. + References No definition available. + Details
Name: | csgs_SettlementAndMerchantReserveLiabilitiesCurrent
Namespace Prefix: | csgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash received or short term receivables for unsettled money transfers, money orders, consumer payments, or business to business payments. Settlement assets include clearing and settling customers payments due to and from financial institutions and may include cash and cash equivalents. + References No definition available. + Details
Name: | us-gaap_SettlementAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amounts payable for money transfers, money orders, and consumer payment service arrangements. Settlement liabilities include amounts payable to intermediaries for global payment transfers. + References No definition available. + Details
Name: | us-gaap_SettlementLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant