REVENUE, DIRECT COSTS AND GROSS MARGIN (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue	$ 106,109	$ 110,028	$ 122,743	$ 124,317	$ 136,677	$ 149,278	$ 151,070	$ 144,167	$ 463,197	$ 581,192	$ 562,572
Direct costs									275,487	358,347	353,143
Gross margin	$ 44,439	$ 45,145	$ 50,222	$ 47,904	$ 53,258	$ 55,687	$ 59,871	$ 54,029	187,710	222,845	209,429
Temporary Contracting
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue									305,052	408,106	407,178
Direct costs									262,322	345,586	341,911
Gross margin									42,730	62,520	65,267
Permanent Recruitment
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue									118,934	126,686	113,301
Direct costs									2,733	2,369	2,219
Gross margin									116,201	124,317	111,082
Other
Revenue Direct Costs And Gross Margin Line Items [Line Items]
Revenue									39,211	46,400	42,093
Direct costs									10,432	10,392	9,013
Gross margin									$ 28,779	$ 36,008	$ 33,080