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Stockholders' Equity (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Jul. 25, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
CustomerAccount
Jan. 31, 2015
Feb. 28, 2015
Stockholders' Equity Transactions              
Remaining number of shares available for repurchase   1,400,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased     1,400,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased    
Repurchase of common stock for employee tax withholdings, shares   252,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 264,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 197,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation      
Repurchase of common stock for tax withholdings, value   $ 6.9us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation $ 5.4us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation $ 3.2us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation      
Cash dividends declared per common share   $ 0.6225us-gaap_CommonStockDividendsPerShareDeclared $ 0.4500us-gaap_CommonStockDividendsPerShareDeclared        
Cash dividend   21.3us-gaap_DividendsCommonStockCash 15.2us-gaap_DividendsCommonStockCash        
Stock warrants term 10 years            
Stock warrants, exercise price $ 26.68invest_InvestmentWarrantsExercisePrice            
Senior Subordinated Convertible Notes 2010              
Stockholders' Equity Transactions              
Carrying amount of the equity component of convertible debt securities outstanding   22.9us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		 22.9us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		   22.9us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		    
Migration Of Comcast Current Residential Customer Accounts              
Stockholders' Equity Transactions              
Issuance of stock warrants 1,900,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember		            
Number of customer account migrated         2,000,000csgs_NumberOfCustomerAccountsMigrated
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember		    
Migration Of Comcast Current Residential Customer Accounts | First 25 % of Stock Warrants              
Stockholders' Equity Transactions              
Vesting percentage of stock warrants         25.00%csgs_WarrantVestingPercentage
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_FirstTwentyFivePercentageMember		    
Number of customer account migrated         500,000csgs_NumberOfCustomerAccountsMigrated
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_FirstTwentyFivePercentageMember		    
Number of stock warrants vesting         500,000csgs_NumberOfStockWarrantsVesting
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_FirstTwentyFivePercentageMember		    
Fair value of stock warrants vesting         3.6csgs_FairValueOfStockWarrants
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_FirstTwentyFivePercentageMember		    
Migration Of Comcast Current Residential Customer Accounts | Second 25 % of Stock Warrants              
Stockholders' Equity Transactions              
Vesting date of stock warrants   2015-01          
Fair value of stock warrants vesting 3.7csgs_FairValueOfStockWarrants
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_SecondTwentyFivePercentageMember		            
Migration Of Comcast Current Residential Customer Accounts | Third 25 % of Stock Warrants              
Stockholders' Equity Transactions              
Vesting percentage of stock warrants   25.00%csgs_WarrantVestingPercentage
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_ThirdTwentyFivePercentageMember		          
Number of customer account migrated   5,500,000csgs_NumberOfCustomerAccountsMigrated
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_ThirdTwentyFivePercentageMember		          
Migration Of Comcast Current Residential Customer Accounts | Last 25 % of Stock Warrants              
Stockholders' Equity Transactions              
Vesting percentage of stock warrants   25.00%csgs_WarrantVestingPercentage
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_LastTwentyFivePercentageMember		          
Number of customer account migrated   5,700,000csgs_AdditionalNumberOfCustomerAccountsMigrated
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_LastTwentyFivePercentageMember		          
Total target of customer account migrations   11,200,000csgs_TargetNumberOfCustomerAccountMigrated
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_LastTwentyFivePercentageMember		          
Migration Of Comcast Current Residential Customer Accounts | Last 25 % of Stock Warrants | Minimum              
Stockholders' Equity Transactions              
Number of customer account migrated   5,500,000csgs_NumberOfCustomerAccountsMigrated
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_VestingAxis
= csgs_LastTwentyFivePercentageMember		          
Migration Of Comcast Acquired Additional Residential Customer Accounts              
Stockholders' Equity Transactions              
Issuance of stock warrants 1,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastAcquiredAdditionalResidentialCustomerAccountsMember		            
Comcast              
Stockholders' Equity Transactions              
Issuance of stock warrants 2,900,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= csgs_ComcastMember		            
Amount of unvested stock warrants that become vested upon a fundamental change of the Company   50.00%csgs_VestingOfWarrantsUponFundamentalChangeOfCompany
/ dei_LegalEntityAxis
= csgs_ComcastMember		          
Beneficial ownership required for potential cash settlement 19.99%csgs_BeneficialOwnershipRequiredForPotentialCashSettlement
/ dei_LegalEntityAxis
= csgs_ComcastMember		            
Client contract incentive related to stock warrants   6.7csgs_ClientContractIncentiveRelatedToStockWarrants
/ dei_LegalEntityAxis
= csgs_ComcastMember		          
Amortization expense of client contract incentive related to stock warrants   $ 0.4csgs_AmortizationOfClientContractIncentiveRelatedToStockWarrants
/ dei_LegalEntityAxis
= csgs_ComcastMember		          
Class of stock warrants exercised   0csgs_StockWarrantsExercised
/ dei_LegalEntityAxis
= csgs_ComcastMember		          
Subsequent Event              
Stockholders' Equity Transactions              
Remaining number of shares available for repurchase             9,000,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Increase in the number of shares authorized for repurchase             7,500,000csgs_AdditionalShareRepurchaseAuthorized
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Number of shares authorized for repurchase under stock repurchase program             42,500,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Cash dividends declared per common share           $ 0.1575us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
2015 Quarterly Cash Dividends           $ 0.175csgs_CommonStockDividendPerShareForFuturePeriods
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Subsequent Event | Migration Of Comcast Current Residential Customer Accounts | Second 25 % of Stock Warrants              
Stockholders' Equity Transactions              
Vesting percentage of stock warrants           25.00%csgs_WarrantVestingPercentage
/ us-gaap_StatementScenarioAxis
= csgs_MigrationOfComcastCurrentResidentialCustomerAccountsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= csgs_SecondTwentyFivePercentageMember