Significant Customer	12 Months Ended
Significant Customer	Dec. 31, 2014
Segment Reporting [Abstract]
Significant Customer	Significant Customer International Business Machines Corporation (IBM) is the Company’s largest customer. During the 2014 fourth quarter, our contract with IBM was renewed for three years until December 31, 2017. In 2014, 2013, and 2012, IBM accounted for $90.5 million or 23.0%, $101.7 million or 24.3%, and $113.8 million or 26.8% of the Company’s consolidated revenue, respectively. In 2012, IBM sold its retail business to another large company. While CTG retained the work, this reduced our revenue from IBM in 2012 by $3.2 million. The Company’s accounts receivable from IBM at December 31, 2014 and 2013 amounted to $7.8 million and $11.5 million, respectively. No other customer accounted for more than 10% of revenue in 2014, 2013, or 2012. In January 2014, IBM announced its intention to sell its x86 server division to Lenovo, and the initial closing of that sale occurred on September 29, 2014. A portion of the Company's 2014 and 2013 revenue from IBM was related to the x86 server division. The Company expects to continue to retain a significant share of the revenue derived from the x86 server division despite the transition of the division from IBM to Lenovo.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

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