REVENUE, DIRECT COSTS AND GROSS MARGIN Revenue, Direct Costs and Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	$ 103,405	$ 101,227
Direct costs	60,973	59,965
Gross margin	42,432	41,262
Temporary Contracting
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	66,453	65,856
Direct costs	58,423	57,222
Gross margin	8,030	8,634
Permanent Recruitment
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	28,018	26,572
Direct costs	508	574
Gross margin	27,510	25,998
Talent Management [Member]
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	8,416	8,436
Direct costs	1,505	1,683
Gross margin	6,911	6,753
Other Than Temporary Contracting, Permanent Recruitment and Talent Management [Member] [Member]
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	518	363
Direct costs	537	486
Gross margin	$ (19)	$ (123)