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Commitments, Guarantees and Contingencies (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Other Commitments [Line Items]
Letter of credit amount	$ 200
Restricted cash included in current and non-current assets	1,781	$ 1,700	$ 1,787
Money transmitter bonds outstanding	$ 24,000
Warranty period	90 days
Surety And Money Transmitter Bonds
Other Commitments [Line Items]
Restricted assets used to collateralize guarantees	$ 3,900

X

- Definition

Money transmitter bonds outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	csgs_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Typical warranty period from delivery of the solution or offering.

+ References

No definition available.

+ Details

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Namespace Prefix:	csgs_
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Balance Type:	na
Period Type:	duration

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
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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.

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X

- Definition

Amount of cash and cash equivalent restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02(1))
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- Details

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