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Employee Retirement Benefit Plans (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Retirement Benefit Plans (Textual) [Abstract]      
Maximum employee annual contributions, percent 100.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
US Based Employees      
Employee Retirement Benefit Plans (Textual) [Abstract]      
Total contributions under plans $ 9.0us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= csgs_UsBasedEmployeesMember		 $ 9.7us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= csgs_UsBasedEmployeesMember		 $ 9.0us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= csgs_UsBasedEmployeesMember
Non US Based Employees      
Employee Retirement Benefit Plans (Textual) [Abstract]      
Total contributions under plans $ 5.0us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= csgs_NonUsBasedEmployeesMember		 $ 4.8us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= csgs_NonUsBasedEmployeesMember		 $ 4.6us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= csgs_NonUsBasedEmployeesMember