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Debt -Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Carrying value of debt $ 285,472us-gaap_LongTermDebt $ 255,831us-gaap_LongTermDebt
Current portion of long-term debt (7,500)us-gaap_LongTermDebtCurrent (22,500)us-gaap_LongTermDebtCurrent
Long-term debt, net of unamortized original issue discount of $12,653 and $14,169 277,972us-gaap_LongTermDebtNoncurrent 233,331us-gaap_LongTermDebtNoncurrent
Senior Subordinated Convertible Notes 2010    
Debt Instrument [Line Items]    
Carrying value of debt 137,347us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		 135,831us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
2015 Credit Agreement | Term Loan    
Debt Instrument [Line Items]    
Carrying value of debt 148,125us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= csgs_TwoThousandFifteenCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= csgs_TermLoanMember		  
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