Accumulated Other Comprehensive Loss (Parenthetic) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Loss (Textual) [Abstract]
Tax attributable to accumulated pension loss	$ 1,004	$ 1,040

Tax pertaining to accumulated other comprehensive loss

No definition available.

Name:	ctg_TaxPertainingToAccumulatedOtherComprehensiveLoss
Namespace Prefix:	ctg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant