SEGMENT AND GEOGRAPHIC DATA Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segments	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segments			3
Revenue, from external customers	$ 122,743	$ 151,070	$ 247,060	$ 295,237
Inter-segment revenue	0	0	0	0
Total revenue	122,743	151,070	247,060	295,237
Gross margin, from external customers	50,222	59,871	98,126	113,900
Inter-segment gross margin	0	0	0	0
Gross margin	50,222	59,871	98,126	113,900
Gain on sale and exit of businesses	20,005	0	20,005	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	2,060	1,117	3,403	1,231
EBITDA (loss)	14,577	(1,766)	8,985	(3,966)
Depreciation and amortization	974	1,404	2,085	2,774
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(369)	(202)	(449)	(342)
Income (loss) from continuing operations before provision for income taxes	13,234	(3,372)	6,451	(7,082)
Accounts receivable, net	75,511	89,698	75,511	89,698	$ 74,079
Long-lived assets, net of accumulated depreciation and amortization	10,261	15,069	10,261	15,069
Total assets	137,250	155,920	137,250	155,920	$ 139,672
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	16,033	15,964	30,133	29,946
Long-lived assets, net of accumulated depreciation and amortization	2,617	3,574	2,617	3,574
Hudson Europe
Segment Reporting Information [Line Items]
Total revenue	15,547	27,891	37,405	54,915
Long-lived assets, net of accumulated depreciation and amortization	90	461	90	461
Operating Segments | Hudson Americas
Segment Reporting Information [Line Items]
Revenue, from external customers	10,183	13,158	21,161	25,401
Inter-segment revenue	0	37	0	38
Total revenue	10,183	13,195	21,161	25,439
Gross margin, from external customers	5,081	5,393	9,702	9,894
Inter-segment gross margin	(2)	33	(9)	32
Gross margin	5,079	5,426	9,693	9,926
Gain on sale and exit of businesses	15,938	0	15,938	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	(5)	3	417	93
EBITDA (loss)	15,444	101	13,814	(359)
Depreciation and amortization	106	104	208	223
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(310)	2	(344)	0
Income (loss) from continuing operations before provision for income taxes	15,028	(1)	13,262	(582)
Accounts receivable, net	7,155	7,468	7,155	7,468
Long-lived assets, net of accumulated depreciation and amortization	443	548	443	548
Total assets	9,202	20,067	9,202	20,067
Operating Segments | Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue, from external customers	57,374	65,101	110,514	121,532
Inter-segment revenue	0	0	0	0
Total revenue	57,374	65,101	110,514	121,532
Gross margin, from external customers	23,819	24,519	44,697	45,430
Inter-segment gross margin	(207)	1	(239)	(67)
Gross margin	23,612	24,520	44,458	45,363
Gain on sale and exit of businesses	0	0	0	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	325	1,114	333	1,115
EBITDA (loss)	(630)	(581)	173	(884)
Depreciation and amortization	572	803	1,243	1,548
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(42)	(37)	(83)	(80)
Income (loss) from continuing operations before provision for income taxes	(1,244)	(1,421)	(1,153)	(2,512)
Accounts receivable, net	30,383	30,505	30,383	30,505
Long-lived assets, net of accumulated depreciation and amortization	7,090	10,762	7,090	10,762
Total assets	49,717	61,631	49,717	61,631
Operating Segments | Hudson Europe
Segment Reporting Information [Line Items]
Revenue, from external customers	55,186	72,811	115,385	148,304
Inter-segment revenue	231	28	246	106
Total revenue	55,417	72,839	115,631	148,410
Gross margin, from external customers	21,322	29,959	43,727	58,576
Inter-segment gross margin	209	(35)	248	37
Gross margin	21,531	29,924	43,975	58,613
Gain on sale and exit of businesses	4,067	0	4,067	0
Business reorganization expenses (recovery) and impairment of long lived assets expense	520	0	1,400	23
EBITDA (loss)	3,449	1,113	1,298	1,800
Depreciation and amortization	219	360	446	705
Intercompany interest income (expense), net	(138)	(132)	(268)	(262)
Interest income (expense), net	(14)	(23)	(19)	(12)
Income (loss) from continuing operations before provision for income taxes	3,078	598	565	821
Accounts receivable, net	37,973	51,725	37,973	51,725
Long-lived assets, net of accumulated depreciation and amortization	1,973	3,294	1,973	3,294
Total assets	58,580	71,148	58,580	71,148
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	1,220	0	1,253	0
EBITDA (loss)	(3,686)	(2,399)	(6,300)	(4,523)
Depreciation and amortization	77	137	188	298
Intercompany interest income (expense), net	134	132	268	250
Interest income (expense), net	(3)	(144)	(3)	(250)
Income (loss) from continuing operations before provision for income taxes	(3,632)	(2,548)	(6,223)	(4,821)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	755	465	755	465
Total assets	19,751	3,074	19,751	3,074
Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(231)	(65)	(246)	(144)
Total revenue	(231)	(65)	(246)	(144)
Gross margin, from external customers	0	0	0	0
Inter-segment gross margin	0	1	0	(2)
Gross margin	0	1	0	(2)
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	4	0	0	12
Interest income (expense), net	0	0	0	0
Income (loss) from continuing operations before provision for income taxes	4	0	0	12
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