Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 257,458us-gaap_Revenues	$ 276,272us-gaap_Revenues
Cost of services	210,688us-gaap_CostOfServices	225,509us-gaap_CostOfServices
Gross profit	46,770us-gaap_GrossProfit	50,763us-gaap_GrossProfit
Operating and administrative expenses	45,273us-gaap_OperatingExpenses	45,708us-gaap_OperatingExpenses
Restructuring Charges	47us-gaap_RestructuringCharges	370us-gaap_RestructuringCharges
Loss on disposition	310us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness
Operating profit	1,140us-gaap_OperatingIncomeLoss	4,685us-gaap_OperatingIncomeLoss
Other income (expense), net	13us-gaap_OtherNonoperatingIncomeExpense	(82)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	1,153	4,603
Income tax expense	766us-gaap_IncomeTaxExpenseBenefit	2,562us-gaap_IncomeTaxExpenseBenefit
Net income	387us-gaap_ProfitLoss	2,041us-gaap_ProfitLoss
Less: Income attributable to the noncontrolling interest	(83)	4
Net income attributable to CDI	$ 470us-gaap_NetIncomeLoss	$ 2,037us-gaap_NetIncomeLoss
Earnings per common share:
Basic (per share)	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic
Diluted (per share)	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted

Total costs related to services rendered by an entity during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688