REVENUE, DIRECT COSTS AND GROSS MARGIN Revenue, Direct Costs and Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	$ 101,227	$ 124,317
Direct costs	59,965	76,413
Gross margin	41,262	47,904
Temporary Contracting
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	65,856	86,580
Direct costs	57,222	73,616
Gross margin	8,634	12,964
Permanent Recruitment
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	26,572	28,106
Direct costs	574	485
Gross margin	25,998	27,621
Other
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	8,799	9,631
Direct costs	2,169	2,312
Gross margin	$ 6,630	$ 7,319