Summary of Significant Accounting Policies - Schedule of Net Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Postemployment Benefits [Abstract]
Amortization of actuarial losses	$ 277
Income tax	(72)
Net of tax	$ 205

Before tax amount of the income statement impact of the reclassification adjustment for actuarial losses (gains) recognized as a component of net periodic benefit cost.

No definition available.

Name:	ctgx_OtherComprehensiveLossReclassificationPensionAndOtherPostretirementBenefitPlansNetLossRecognizedInNetPeriodicBenefitCostBeforeTax
Namespace Prefix:	ctgx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration