SEGMENT AND GEOGRAPHIC DATA Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segments	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segments			3
Revenue, from external customers	$ 110,028	$ 149,278	$ 357,088	$ 444,515
Inter-segment revenue	0	0	0	0
Total revenue	110,028	149,278	357,088	444,515
Gross margin, from external customers	45,145	55,687	143,271	169,588
Inter-segment gross margin	0	0	0	0
Gross margin	45,145	55,687	143,271	169,588
Gain on sale and exit of businesses	(187)	0	19,818	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	2,264	794	5,667	2,026
EBITDA (loss)	(2,629)	(3,470)	6,356	(7,435)
Depreciation and amortization	955	1,467	3,040	4,242
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(93)	(192)	(542)	(533)
Income (loss) from continuing operations before provision for income taxes	(3,677)	(5,129)	2,774	(12,210)
Accounts receivable, net	65,721	83,116	65,721	83,116	$ 74,079
Long-lived assets, net of accumulated depreciation and amortization	9,792	14,054	9,792	14,054
Total assets	128,418	147,024	128,418	147,024	$ 139,672
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	15,534	16,434	45,666	46,381
Long-lived assets, net of accumulated depreciation and amortization	2,887	3,367	2,887	3,367
Hudson Europe
Segment Reporting Information [Line Items]
Total revenue	10,582	23,293	47,986	78,208
Long-lived assets, net of accumulated depreciation and amortization	95	378	95	378
Operating Segments | Hudson Americas
Segment Reporting Information [Line Items]
Revenue, from external customers	3,735	13,036	24,896	38,437
Inter-segment revenue	0	11	0	48
Total revenue	3,735	13,047	24,896	38,485
Gross margin, from external customers	3,176	5,570	12,876	15,464
Inter-segment gross margin	(3)	3	(10)	34
Gross margin	3,173	5,573	12,866	15,498
Gain on sale and exit of businesses	(20)	0	15,918	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	589	0	1,006	93
EBITDA (loss)	(1,029)	33	12,788	(326)
Depreciation and amortization	383	137	591	360
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	0	(35)	(346)	(35)
Income (loss) from continuing operations before provision for income taxes	(1,412)	(139)	11,851	(721)
Accounts receivable, net	3,876	6,600	3,876	6,600
Long-lived assets, net of accumulated depreciation and amortization	64	1,084	64	1,084
Total assets	8,128	20,552	8,128	20,552
Operating Segments | Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue, from external customers	55,609	66,990	166,123	188,522
Inter-segment revenue	0	0	0	0
Total revenue	55,609	66,990	166,123	188,522
Gross margin, from external customers	23,376	24,654	68,073	70,083
Inter-segment gross margin	(122)	(57)	(361)	(125)
Gross margin	23,254	24,597	67,712	69,958
Gain on sale and exit of businesses	0	0	0	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	336	140	669	1,255
EBITDA (loss)	1,680	250	1,852	(635)
Depreciation and amortization	333	918	1,576	2,465
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(68)	(74)	(152)	(154)
Income (loss) from continuing operations before provision for income taxes	1,279	(742)	124	(3,254)
Accounts receivable, net	28,317	30,775	28,317	30,775
Long-lived assets, net of accumulated depreciation and amortization	7,010	9,674	7,010	9,674
Total assets	46,576	57,773	46,576	57,773
Operating Segments | Hudson Europe
Segment Reporting Information [Line Items]
Revenue, from external customers	50,684	69,252	166,069	217,556
Inter-segment revenue	123	68	369	174
Total revenue	50,807	69,320	166,438	217,730
Gross margin, from external customers	18,593	25,463	62,322	84,041
Inter-segment gross margin	125	55	371	90
Gross margin	18,718	25,518	62,693	84,131
Gain on sale and exit of businesses	(167)	0	3,900	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	1,278	421	2,678	444
EBITDA (loss)	(2,094)	(2,292)	(798)	(491)
Depreciation and amortization	171	301	618	1,006
Intercompany interest income (expense), net	(125)	(131)	(394)	(393)
Interest income (expense), net	(20)	3	(35)	(9)
Income (loss) from continuing operations before provision for income taxes	(2,410)	(2,721)	(1,845)	(1,899)
Accounts receivable, net	33,528	45,741	33,528	45,741
Long-lived assets, net of accumulated depreciation and amortization	1,969	2,654	1,969	2,654
Total assets	55,587	64,851	55,587	64,851
Corporate
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	0	0	0	0
Total revenue	0	0	0	0
Gross margin, from external customers	0	0	0	0
Inter-segment gross margin	0	0	0	0
Gross margin	0	0	0	0
Gain on sale and exit of businesses	0	0	0	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	61	233	1,314	234
EBITDA (loss)	(1,186)	(1,461)	(7,486)	(5,983)
Depreciation and amortization	68	111	255	411
Intercompany interest income (expense), net	125	131	394	393
Interest income (expense), net	(5)	(86)	(9)	(335)
Income (loss) from continuing operations before provision for income taxes	(1,134)	(1,527)	(7,356)	(6,336)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	749	642	749	642
Total assets	18,127	3,848	18,127	3,848
Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(123)	(79)	(369)	(222)
Total revenue	(123)	(79)	(369)	(222)
Gross margin, from external customers	0	0	0	0
Inter-segment gross margin	0	(1)	0	1
Gross margin	0	(1)	0	1
Gain on sale and exit of businesses	0	0	0	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	0	0	0	0
EBITDA (loss)	0	0	0	0
Depreciation and amortization	0	0	0	0
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	0	0	0	0
Income (loss) from continuing operations before provision for income taxes	0	0	0	0
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	0	0	0	0
Total assets	$ 0	$ 0	$ 0	$ 0