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Business	3 Months Ended
Business	Mar. 31, 2012
Business [Abstract]
Business	Business CDI Corp. and Subsidiaries (the “Company” or “CDI”) is an integrated engineering and technology services organization providing differentiated, client-focused solutions in select global industries. The Company derives most of its revenue by providing these services to large and mid-sized companies located primarily in the United States (“U.S.”), United Kingdom (“UK”) and Canada.