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Stockholders' Equity and Equity Compensation Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jan. 31, 2015
Mar. 31, 2015
Jan. 31, 2015
Feb. 28, 2015
Stockholders Equity And Equity Compensation Plans [Line Items]              
Increase in number of shares authorized for repurchase             7,500,000csgs_AdditionalShareRepurchaseAuthorized
Number of shares authorized for repurchase under stock repurchase program   0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased         42,500,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Shares repurchased 300,000us-gaap_TreasuryStockSharesAcquired            
Total amount paid $ 7.0us-gaap_TreasuryStockValueAcquiredCostMethod            
Weighted-average price per share $ 27.06us-gaap_TreasuryStockAcquiredAverageCostPerShare            
Remaining number of shares available for repurchase 7,300,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased       7,300,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased    
Repurchase of common stock for employee tax withholdings, shares 200,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 200,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation          
Repurchase of common stock for tax withholdings, value 5.8us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 6.5us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation          
Cash dividends declared per common share $ 0.175us-gaap_CommonStockDividendsPerShareDeclared $ 0.150us-gaap_CommonStockDividendsPerShareDeclared          
Cash dividend 5.7us-gaap_DividendsCommonStockCash 5.1us-gaap_DividendsCommonStockCash          
Stock warrants term     10 years        
Stock warrants, exercise price     $ 26.68invest_InvestmentWarrantsExercisePrice        
Stock-based compensation expense 5.1us-gaap_AllocatedShareBasedCompensationExpense 3.8us-gaap_AllocatedShareBasedCompensationExpense          
Performance Shares              
Stockholders Equity And Equity Compensation Plans [Line Items]              
Performance based awards granted to executive management shares 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		            
Stock-based compensation expense 3 years            
Restricted common stock              
Stockholders Equity And Equity Compensation Plans [Line Items]              
Stock-based compensation expense 4 years            
Migration Of Comcast Current Residential Customer Accounts              
Stockholders Equity And Equity Compensation Plans [Line Items]              
Number of stock warrants vesting       500,000csgs_NumberOfStockWarrantsVesting
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember		 1,000,000csgs_NumberOfStockWarrantsVesting
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember		    
Vesting date of stock warrants           2015-01  
Fair value of stock warrants vesting           3.7csgs_FairValueOfStockWarrants
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember		  
Comcast Corporation              
Stockholders Equity And Equity Compensation Plans [Line Items]              
Issuance of stock warrants     2,900,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= csgs_ComcastMember		        
Client contract incentive related to stock warrants 7.3csgs_ClientContractIncentiveRelatedToStockWarrants
/ dei_LegalEntityAxis
= csgs_ComcastMember		            
Amortization expense of client contract incentive related to stock warrants 0.8csgs_AmortizationOfClientContractIncentiveRelatedToStockWarrants
/ dei_LegalEntityAxis
= csgs_ComcastMember		            
Stock warrants exercised 0csgs_StockWarrantsExercised
/ dei_LegalEntityAxis
= csgs_ComcastMember		            
ASR Agreement              
Stockholders Equity And Equity Compensation Plans [Line Items]              
Shares repurchased 1,300,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_PlanNameAxis
= csgs_AcceleratedSharesRepurchaseAgreementMember		       1,300,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_PlanNameAxis
= csgs_AcceleratedSharesRepurchaseAgreementMember		    
Total amount paid         40.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_PlanNameAxis
= csgs_AcceleratedSharesRepurchaseAgreementMember		    
Accelerated share repurchase agreement, total amount paid $ 50csgs_AcceleratedShareRepurchaseAgreementAmountPaid
/ us-gaap_PlanNameAxis
= csgs_AcceleratedSharesRepurchaseAgreementMember		       50csgs_AcceleratedShareRepurchaseAgreementAmountPaid
/ us-gaap_PlanNameAxis
= csgs_AcceleratedSharesRepurchaseAgreementMember