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Deferred Compensation Benefits Anticipated Benefit Payments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
ESBP  
Anticipated Benefit Payments  
2015 $ 725us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_ExecutiveSupplementalBenefitPlanMember
2016 670us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_ExecutiveSupplementalBenefitPlanMember
2017 654us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_ExecutiveSupplementalBenefitPlanMember
2018 655us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_ExecutiveSupplementalBenefitPlanMember
2019 657us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_ExecutiveSupplementalBenefitPlanMember
2020 - 2024 2,942us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_ExecutiveSupplementalBenefitPlanMember
Total 6,303ctg_DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_ExecutiveSupplementalBenefitPlanMember
NDBP  
Anticipated Benefit Payments  
2015 150us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_NetherlandsDefinedBenefitPlanNdbpMember
2016 165us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_NetherlandsDefinedBenefitPlanNdbpMember
2017 186us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_NetherlandsDefinedBenefitPlanNdbpMember
2018 227us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_NetherlandsDefinedBenefitPlanNdbpMember
2019 258us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_NetherlandsDefinedBenefitPlanNdbpMember
2020 - 2024 1,528us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_NetherlandsDefinedBenefitPlanNdbpMember
Total $ 2,514ctg_DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ctg_NetherlandsDefinedBenefitPlanNdbpMember