DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 17,015	$ 14,517	$ 33,230	$ 28,472
Direct costs	6,214	3,812	12,275	7,765
Gross margin	10,801	10,705	20,955	20,707
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	99,074	108,463	188,524
Direct costs	0	61,453	69,800	118,473
Gross margin	0	37,621	38,663	70,051
Permanent Recruitment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	11,696	10,987	23,385	21,055
Direct costs	1,464	642	3,482	1,090
Gross margin	10,232	10,345	19,903	19,965
Permanent Recruitment | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	21,255	20,700	39,253
Direct costs	0	120	190	249
Gross margin	0	21,135	20,510	39,004
Contracting | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	66,695	76,615	129,229
Direct costs	0	58,886	67,980	113,773
Gross margin	0	7,809	8,635	15,456
Talent Management | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	10,559	10,694	18,974
Direct costs	0	1,915	1,225	3,413
Gross margin	0	8,644	9,469	15,561
Other | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	565	454	1,068
Direct costs	0	532	405	1,038
Gross margin	$ 0	$ 33	$ 49	$ 30