DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 17,127	$ 15,898	$ 50,357	$ 44,371
Direct costs	6,246	4,728	18,521	12,492
Gross profit	10,881	11,170	31,836	31,879
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	102,210	108,463	290,733
Direct costs	0	66,135	69,800	184,609
Gross profit	0	36,075	38,663	106,124
Permanent Recruitment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	11,043	11,193	34,428	32,249
Direct costs	699	473	4,181	1,562
Gross profit	10,344	10,720	30,247	30,687
Permanent Recruitment | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	20,590	20,700	59,742
Direct costs	0	62	190	190
Gross profit	0	20,528	20,510	59,552
Contracting | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	72,392	76,615	201,691
Direct costs	0	64,005	67,980	177,847
Gross profit	0	8,387	8,635	23,844
Talent Management | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	8,680	10,694	27,656
Direct costs	0	1,500	1,225	4,915
Gross profit	0	7,180	9,469	22,741
Other | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	548	454	1,644
Direct costs	0	568	405	1,657
Gross profit	$ 0	$ (20)	$ 49	$ (13)