SEGMENT AND GEOGRAPHIC DATA Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segments	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segments			3
Revenue, from external customers	$ 108,136	$ 110,028	$ 322,430	$ 357,088
Inter-segment revenue	0	0	0	0
Total revenue	108,136	110,028	322,430	357,088
Gross margin, from external customers	43,542	45,145	131,643	143,271
Inter-segment gross margin	0	0	0	0
Gross margin	43,542	45,145	131,643	143,271
Gain (Loss) on Disposition of Business, Continuing Operations	0	(187)	0	19,818
Business reorganization expenses (recovery)	183	2,264	964	5,667
EBITDA (loss)	(280)	(2,629)	(5,067)	6,356
Depreciation and amortization	801	955	2,294	3,040
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(109)	(93)	(264)	(542)
Income (loss) from continuing operations before provision for income taxes	(1,190)	(3,677)	(7,625)	2,774
Accounts receivable, net	64,930	65,721	64,930	65,721	$ 62,420
Long-lived assets, net of accumulated depreciation and amortization	9,248	9,792	9,248	9,792
Total assets	104,941	128,418	104,941	128,418	$ 124,949
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	14,808	15,534	40,904	45,666
Long-lived assets, net of accumulated depreciation and amortization	2,907	2,887	2,907	2,887
Hudson Europe
Segment Reporting Information [Line Items]
Total revenue	12,356	10,582	39,382	47,986
Long-lived assets, net of accumulated depreciation and amortization	196	95	196	95
Operating Segments | Hudson Americas
Segment Reporting Information [Line Items]
Revenue, from external customers	4,163	3,735	11,660	24,896
Inter-segment revenue	42	0	21	0
Total revenue	4,205	3,735	11,681	24,896
Gross margin, from external customers	3,691	3,176	10,210	12,876
Inter-segment gross margin	13	(3)	(11)	(10)
Gross margin	3,704	3,173	10,199	12,866
Gain (Loss) on Disposition of Business, Continuing Operations	0	(20)	0	15,918
Business reorganization expenses (recovery)	(3)	589	(41)	1,006
EBITDA (loss)	326	(1,029)	313	12,788
Depreciation and amortization	12	383	43	591
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	0	0	0	(346)
Income (loss) from continuing operations before provision for income taxes	314	(1,412)	270	11,851
Accounts receivable, net	2,937	3,876	2,937	3,876
Long-lived assets, net of accumulated depreciation and amortization	8	64	8	64
Total assets	5,383	8,128	5,383	8,128
Operating Segments | Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue, from external customers	64,607	55,609	177,717	166,123
Inter-segment revenue	0	0	(1)	0
Total revenue	64,607	55,609	177,716	166,123
Gross margin, from external customers	22,414	23,376	63,601	68,073
Inter-segment gross margin	(59)	(122)	(182)	(361)
Gross margin	22,355	23,254	63,419	67,712
Gain (Loss) on Disposition of Business, Continuing Operations	0	0	0	0
Business reorganization expenses (recovery)	(1)	336	273	669
EBITDA (loss)	275	1,680	(370)	1,852
Depreciation and amortization	457	333	1,296	1,576
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(101)	(68)	(230)	(152)
Income (loss) from continuing operations before provision for income taxes	(283)	1,279	(1,896)	124
Accounts receivable, net	34,806	28,317	34,806	28,317
Long-lived assets, net of accumulated depreciation and amortization	7,364	7,010	7,364	7,010
Total assets	53,778	46,576	53,778	46,576
Operating Segments | Hudson Europe
Segment Reporting Information [Line Items]
Revenue, from external customers	39,366	50,684	133,053	166,069
Inter-segment revenue	73	123	220	369
Total revenue	39,439	50,807	133,273	166,438
Gross margin, from external customers	17,437	18,593	57,832	62,322
Inter-segment gross margin	46	125	193	371
Gross margin	17,483	18,718	58,025	62,693
Gain (Loss) on Disposition of Business, Continuing Operations	0	(167)	0	3,900
Business reorganization expenses (recovery)	188	1,278	781	2,678
EBITDA (loss)	(466)	(2,094)	761	(798)
Depreciation and amortization	253	171	629	618
Intercompany interest income (expense), net	(48)	(125)	(163)	(394)
Interest income (expense), net	(6)	(20)	(28)	(35)
Income (loss) from continuing operations before provision for income taxes	(773)	(2,410)	(59)	(1,845)
Accounts receivable, net	27,187	33,528	27,187	33,528
Long-lived assets, net of accumulated depreciation and amortization	1,431	1,969	1,431	1,969
Total assets	42,978	55,587	42,978	55,587
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 (Loss) on Disposition of Business, Continuing Operations	0	0	0	0
Business reorganization expenses (recovery)	(1)	61	(49)	1,314
EBITDA (loss)	(415)	(1,186)	(5,771)	(7,486)
Depreciation and amortization	79	68	326	255
Intercompany interest income (expense), net	48	125	163	394
Interest income (expense), net	(2)	(5)	(6)	(9)
Income (loss) from continuing operations before provision for income taxes	(448)	(1,134)	(5,940)	(7,356)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	445	749	445	749
Total assets	2,802	18,127	2,802	18,127
Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(115)	(123)	(240)	(369)
Total revenue	(115)	(123)	(240)	(369)
Gross margin, from external customers	0	0	0	0
Inter-segment gross margin	0	0	0	0
Gross margin	0	0	0	0
Gain (Loss) on Disposition of Business, Continuing Operations	0	0	0	0
Business reorganization expenses (recovery)	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