REVENUE, DIRECT COSTS AND GROSS MARGIN Revenue, Direct Costs and Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	$ 113,067	$ 122,743	$ 214,294	$ 247,060
Direct costs	66,228	72,521	126,193	148,934
Gross margin	46,839	50,222	88,101	98,126
Temporary Contracting
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	72,035	80,389	137,890	166,969
Direct costs	62,956	69,101	120,178	142,717
Gross margin	9,079	11,288	17,712	24,252
Permanent Recruitment
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	29,491	31,873	56,062	59,979
Direct costs	611	697	1,185	1,182
Gross margin	28,880	31,176	54,877	58,797
Other
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	11,541	10,481	20,342	20,112
Direct costs	2,661	2,723	4,830	5,035
Gross margin	$ 8,880	$ 7,758	$ 15,512	$ 15,077