CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Thousands	12 Months Ended
Dec. 31, 2024 USD ($)
Statement of Cash Flows [Abstract]
Cash and settlement assets acquired	$ 46,432

The cash and restricted cash/settlement assets associated with the acquisition of a business during the period.

No definition available.

Name:	csgs_CashAndRestrictedCashAcquiredFromAcquisition
Namespace Prefix:	csgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration