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Earnings Per Common Share (Details Textual) (USD $)
 1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Earnings Per Common Share [Line Items]    
Shares repurchased   300,000us-gaap_TreasuryStockSharesAcquired
Common stock Warrants    
Earnings Per Common Share [Line Items]    
Exercise price of warrants 26.68us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 26.68us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
ASR Agreement    
Earnings Per Common Share [Line Items]    
Shares repurchased 1,300,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_PlanNameAxis
= csgs_AcceleratedSharesRepurchaseAgreementMember		 1,300,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_PlanNameAxis
= csgs_AcceleratedSharesRepurchaseAgreementMember