REVENUE, DIRECT COSTS AND GROSS MARGIN Revenue, Direct Costs and Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	$ 108,136	$ 110,028	$ 322,430	$ 357,088
Direct costs	64,594	64,883	190,787	213,817
Gross margin	43,542	45,145	131,643	143,271
Temporary Contracting
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	70,440	70,810	208,330	237,778
Direct costs	61,619	61,562	181,797	204,279
Gross margin	8,821	9,248	26,533	33,499
Permanent Recruitment
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	28,437	30,263	84,499	90,242
Direct costs	627	867	1,812	2,049
Gross margin	27,810	29,396	82,687	88,193
Other
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	9,259	8,955	29,601	29,068
Direct costs	2,348	2,454	7,178	7,489
Gross margin	$ 6,911	$ 6,501	$ 22,423	$ 21,579