Acquisition and Dispositions (Details) £ in Thousands, $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 16, 2016 GBP (£)	Oct. 06, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 20, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating profit			$ (17,921)	$ (22,129)	$ (28,202)	$ (19,786)
Proceeds from disposition					5,849	360
Loss on disposition of business interests			$ 11,301	$ 0	11,301	$ 310
Enterprise Talent Solutions [Member] | CDI AndersElite Limited Disposition [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition | £	£ 4,500
Consideration received, subordinated debt | £	£ 1,750
Consideration received, percent of equity in Holdings	19.99%
Value of non-cash purchase consideration received | £	£ 500
Loss on disposition of business interests					11,301
Engineering Solutions [Member] | CDI-Pycopsa Disposition [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage							67.00%
Proceeds from sale of interest in business					$ 100
EdgeRock Technologies, LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire businesses		$ 33,400
Contingent consideration arrangements, range of outcomes, high		$ 4,000