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Long-Lived Assets - Summary of Aggregate Amortization Related to Customer Contract Costs (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2021
Minimum | Customer contract incentives |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2024
Minimum | Capitalized costs |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2022
Minimum | Capitalized commission fees |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2022
Maximum | Customer contract incentives |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2026
Maximum | Capitalized costs |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2028
Maximum | Capitalized commission fees |
Finite Lived Intangible Assets [Line Items] |
Intangible assets, amortization year | 2027
Policy election to expense fees as incurred | 1 year

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- Definition Finite-lived intangible assets, amortization year. + References No definition available. + Details
Name: | csgs_IntangibleAssetsAmortizationYear
Namespace Prefix: | csgs_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Policy election to expense fees as incurred. + References No definition available. + Details
Name: | csgs_PolicyElectionToExpenseFeesAsIncurred
Namespace Prefix: | csgs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=csgs_CustomerContractIncentivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=csgs_CapitalizedCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=csgs_CapitalizedCommissionFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |