DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 66,932	$ 59,615
Direct costs	24,828	17,555
Gross profit	42,104	42,060
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	108,463	397,106
Direct costs	69,800	252,430
Gross profit	38,663	144,676
Discontinued Operations | Permanent Recruitment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	20,700	81,490
Direct costs	190	359
Gross profit	20,510	81,131
Discontinued Operations | Contracting
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	76,615	275,375
Direct costs	67,980	243,244
Gross profit	8,635	32,131
Discontinued Operations | Talent Management
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	10,694	38,092
Direct costs	1,225	6,687
Gross profit	9,469	31,405
Discontinued Operations | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	454	2,149
Direct costs	405	2,140
Gross profit	$ 49	$ 9