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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:                      
Federal                 $ 19,221us-gaap_CurrentFederalTaxExpenseBenefit $ 7,260us-gaap_CurrentFederalTaxExpenseBenefit $ 32,121us-gaap_CurrentFederalTaxExpenseBenefit
State                 2,348us-gaap_CurrentStateAndLocalTaxExpenseBenefit 453us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4,133us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign                 2,953us-gaap_CurrentForeignTaxExpenseBenefit 4,273us-gaap_CurrentForeignTaxExpenseBenefit 2,658us-gaap_CurrentForeignTaxExpenseBenefit
Total                 24,522us-gaap_CurrentIncomeTaxExpenseBenefit 11,986us-gaap_CurrentIncomeTaxExpenseBenefit 38,912us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:                      
Federal                 1,139us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,130us-gaap_DeferredFederalIncomeTaxExpenseBenefit (832)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State                 837us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2,329us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (3,977)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign                 (1,935)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (5,277)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (5,758)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total                 41csgs_DeferredIncomeTaxExpenseBenefitTwo (1,818)csgs_DeferredIncomeTaxExpenseBenefitTwo (10,567)csgs_DeferredIncomeTaxExpenseBenefitTwo
Total income tax provision $ 4,083us-gaap_IncomeTaxExpenseBenefit [1] $ 4,831us-gaap_IncomeTaxExpenseBenefit [1] $ 8,338us-gaap_IncomeTaxExpenseBenefit [1] $ 7,311us-gaap_IncomeTaxExpenseBenefit [1] $ 3,401us-gaap_IncomeTaxExpenseBenefit [1] $ 1,331us-gaap_IncomeTaxExpenseBenefit [1] $ 6,790us-gaap_IncomeTaxExpenseBenefit [1] $ (1,354)us-gaap_IncomeTaxExpenseBenefit [1] $ 24,563us-gaap_IncomeTaxExpenseBenefit $ 10,168us-gaap_IncomeTaxExpenseBenefit $ 28,345us-gaap_IncomeTaxExpenseBenefit
[1] Fluctuations in our effective income tax rate between quarters generally relates to the accounting for discrete income tax items in any given quarter, and revisions of estimates for certain income tax components during the year. •For 2014: Our effective income tax rates for the first, second, third, and fourth quarters were 43%, 47%, 48%, and 24%, respectively. The low fourth quarter rate can be mainly attributed to full year impact of the 2014 R&D tax credits, as the legislation was not passed until December 2014.•For 2013: Our effective income tax rates for the first, second, third, and fourth quarters of 2013 were (10)%, 36%, 8%, and 27%, respectively. The negative rate in the first quarter of 2013 reflects the benefit of approximately $6 million of R&D tax credits that we generated in 2012, but were unable to include in the determination of our 2012 effective tax rate as the legislation was not signed into law until 2013. The lower income tax rates for the third and fourth quarter were mainly driven by incremental R&D income tax credits claimed for development activities from previous years and by the reduction of certain tax allowances related mainly to foreign operations, offset by increases in tax reserves for uncertainties, which provided a benefit of approximately $6 million and $2 million, respectively.