Reporting Segments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 169,468		$ 226,693		$ 357,033	$ 460,217
Gross profit	32,284		42,095		66,403	85,370
Operating profit	(6,257)		(6,460)		(12,116)	(10,281)
Other income (expense), net	(309)		(452)		(722)	(601)
Income before income taxes	(6,566)		(6,912)		(12,838)	(10,882)
Restructuring and other related costs	0		240		0	289
Proceeds from sale of assets					15	7
Assets	292,185				292,185		$ 289,292
Depreciation and amortization	2,046		2,625		4,156	5,707
Enterprise Talent Solutions [Member] | CDI AndersElite Limited Disposition [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Loss on disposition of business interests		$ 11,301
Revenue			20,502			43,467
Gross Profit			3,453			7,312
Operating and administrative expenses			4,300			8,668
Operating loss			(847)			(1,356)
Depreciation and amortization			200			300
Operating Segments [Member] | Enterprise Talent Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	86,820		133,480		188,981	273,129
Gross profit	8,779		15,434		19,093	31,915
Operating profit	764		(458)		2,544	677
Restructuring and other related costs	0		90		0	102
Assets	99,272				99,272		102,770
Depreciation and amortization	152		315		307	631
Operating Segments [Member] | Specialty Talent and Technology [Member]
Segment Reporting Information [Line Items]
Revenue	17,208		19,129		35,122	37,522
Gross profit	4,683		5,510		9,638	10,822
Operating profit			(436)			9
Assets	37,438				37,438		38,505
Depreciation and amortization	436		652		876	1,654
Operating Segments [Member] | Specialty Talent and Technology [Member] | EdgeRock Technologies, LLC [Member]
Segment Reporting Information [Line Items]
Operating profit	(1,163)			$ 800	(2,205)
Operating Segments [Member] | Engineering Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	54,316		61,153		110,512	124,407
Gross profit	13,490		14,776		26,971	30,253
Operating profit	(3,420)		(2,943)		(6,021)	(4,878)
Restructuring and other related costs	0		149		0	186
Assets	85,806				85,806		93,067
Depreciation and amortization	978		1,197		1,992	2,468
Real estate exit and related charges	1,200
Operating Segments [Member] | MRI [Member]
Segment Reporting Information [Line Items]
Revenue	11,124		12,931		22,418	25,159
Gross profit	5,332		6,375		10,701	12,380
Operating profit	1,520		1,081		1,769	1,664
Assets	21,374				21,374		22,558
Depreciation and amortization	68		66		136	132
Corporate [Member]
Segment Reporting Information [Line Items]
Operating profit	(3,958)		(3,704)		(8,203)	(7,753)
Restructuring and other related costs	0		1		0	1
Assets	48,295				48,295		$ 32,392
Depreciation and amortization	$ 412		$ 395		$ 845	$ 822