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Summary of Significant Accounting Policies - Revenue by Vertical Market (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue by vertical market as a percentage of total revenue      
Total revenue 100.00%ctg_SalesRevenueServiceNetPercentage 100.00%ctg_SalesRevenueServiceNetPercentage 100.00%ctg_SalesRevenueServiceNetPercentage
Healthcare [Member]      
Revenue by vertical market as a percentage of total revenue      
Total revenue 28.60%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_HealthcareMember		 31.40%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_HealthcareMember		 33.00%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_HealthcareMember
Technology Service Providers [Member]      
Revenue by vertical market as a percentage of total revenue      
Total revenue 26.40%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_TechnologyServiceProvidersMember		 28.00%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_TechnologyServiceProvidersMember		 30.80%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_TechnologyServiceProvidersMember
Financial Services [Member]      
Revenue by vertical market as a percentage of total revenue      
Total revenue 7.90%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_FinancialServicesMember		 6.80%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_FinancialServicesMember		 6.10%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_FinancialServicesMember
Energy [Member]      
Revenue by vertical market as a percentage of total revenue      
Total revenue 6.10%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_EnergyMember		 6.20%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_EnergyMember		 6.00%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_EnergyMember
General Markets [Member]      
Revenue by vertical market as a percentage of total revenue      
Total revenue 31.00%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_GeneralMarketsMember		 27.60%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_GeneralMarketsMember		 24.10%ctg_SalesRevenueServiceNetPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= ctg_GeneralMarketsMember