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Debt - Deferred Financing Costs (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Amortization expenses of deferred financing costs included in Interest expense $ 2.5us-gaap_AmortizationOfFinancingCosts $ 2.6us-gaap_AmortizationOfFinancingCosts $ 2.7us-gaap_AmortizationOfFinancingCosts
Weighted-average interest rate on debt borrowings 6.00%us-gaap_LongtermDebtWeightedAverageInterestRate 5.00%us-gaap_LongtermDebtWeightedAverageInterestRate 6.00%us-gaap_LongtermDebtWeightedAverageInterestRate
Senior Subordinated Convertible Notes 2010      
Debt Instrument [Line Items]      
Deferred financing costs related to convertible notes 1.3us-gaap_DeferredFinanceCostsNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		    
2012 Credit Agreement      
Debt Instrument [Line Items]      
Deferred financing costs related to convertible notes $ 4.2us-gaap_DeferredFinanceCostsNet
/ us-gaap_DebtInstrumentAxis
= csgs_TwoThousandTwelveCreditAgreementMember