Accumulated Other Comprehensive Loss (Details Textual) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Loss (Textual) [Abstract]
Tax attributable to accumulated pension loss	$ 1,022	$ 1,040

Tax pertaining to accumulated other comprehensive loss

No definition available.

Name:	ctgx_TaxPertainingToAccumulatedOtherComprehensiveLoss
Namespace Prefix:	ctgx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant