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Debt -Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Carrying value of debt $ 255,831us-gaap_LongTermDebt $ 265,050us-gaap_LongTermDebt
Current portion of long-term debt (22,500)us-gaap_LongTermDebtCurrent (15,000)us-gaap_LongTermDebtCurrent
Total long-term debt, net 233,331us-gaap_LongTermDebtNoncurrent 250,050us-gaap_LongTermDebtNoncurrent
Senior Subordinated Convertible Notes 2010    
Debt Instrument [Line Items]    
Carrying value of debt 135,831us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		 130,050us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
2012 Credit Agreement | Term Loan    
Debt Instrument [Line Items]    
Carrying value of debt $ 120,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= csgs_TwoThousandTwelveCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= csgs_TermLoanMember		 $ 135,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= csgs_TwoThousandTwelveCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= csgs_TermLoanMember