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Summary of Significant Accounting Policies - Acquisition (Details) (USD $)
 1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]        
Revenue   $ 393,268,000us-gaap_SalesRevenueServicesNet $ 419,036,000us-gaap_SalesRevenueServicesNet $ 424,415,000us-gaap_SalesRevenueServicesNet
Etrinity [Member]        
Business Acquisition [Line Items]        
Purchase price of acquired entity 2,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ctg_EtrinityMember		      
Revenue   $ 2,100,000us-gaap_SalesRevenueServicesNet
/ us-gaap_BusinessAcquisitionAxis
= ctg_EtrinityMember		 $ 2,800,000us-gaap_SalesRevenueServicesNet
/ us-gaap_BusinessAcquisitionAxis
= ctg_EtrinityMember		 $ 3,000,000us-gaap_SalesRevenueServicesNet
/ us-gaap_BusinessAcquisitionAxis
= ctg_EtrinityMember