REVENUE, DIRECT COSTS AND GROSS MARGIN Revenue, Direct Costs and Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	$ 110,028	$ 149,278	$ 357,088	$ 444,515
Direct costs	64,883	93,591	213,817	274,927
Gross margin	45,145	55,687	143,271	169,588
Temporary Contracting
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	70,810	106,981	237,778	312,591
Direct costs	61,562	90,594	204,279	264,982
Gross margin	9,248	16,387	33,499	47,609
Permanent Recruitment
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	30,263	31,713	90,242	96,134
Direct costs	867	736	2,049	1,893
Gross margin	29,396	30,977	88,193	94,241
Other
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	8,955	10,584	29,068	35,790
Direct costs	2,454	2,261	7,489	8,052
Gross margin	$ 6,501	$ 8,323	$ 21,579	$ 27,738