Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Revenue	$ 269,466	$ 280,627
Cost of services	219,315	224,942
Gross profit	50,151	55,685
Operating and administrative expenses	45,238	48,296
Operating profit	4,913	7,389
Other income (expense), net	(51)	(38)
Income before income taxes	4,862	7,351
Income tax expense	2,309	3,437
Net income	2,553	3,914
Less: Income attributable to the noncontrolling interest	62	91
Net income attributable to CDI	$ 2,491	$ 3,823
Earnings per common share:
Basic (per share)	$ 0.13	$ 0.20
Diluted (per share)	$ 0.13	$ 0.20