REVENUE, DIRECT COSTS AND GROSS MARGIN Revenue, Direct Costs and Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	$ 122,743	$ 151,070	$ 247,060	$ 295,237
Direct costs	72,521	91,199	148,934	181,337
Gross margin	50,222	59,871	98,126	113,900
Temporary Contracting
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	80,389	103,441	166,969	205,610
Direct costs	69,101	87,594	142,717	174,389
Gross margin	11,288	15,847	24,252	31,221
Permanent Recruitment
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	31,873	34,725	59,979	64,422
Direct costs	697	671	1,182	1,158
Gross margin	31,176	34,054	58,797	63,264
Other
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	10,481	12,904	20,112	25,205
Direct costs	2,723	2,934	5,035	5,790
Gross margin	$ 7,758	$ 9,970	$ 15,077	$ 19,415