SEGMENT AND GEOGRAPHIC DATA Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) segments	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments										3	3
Revenue, from external customers									$ 422,744			$ 463,197	$ 581,192
Revenue from Related Parties									0			0	0
Total revenue	$ 100,314	$ 108,136	$ 113,067	$ 101,227	$ 106,109	$ 110,028	$ 122,743	$ 124,317	422,744			463,197	581,192
Gross margin, from external customers									174,417			187,710	222,845
Inter-segment gross margin									0			0	0
Gross margin	42,774	$ 43,542	$ 46,839	$ 41,262	44,439	$ 45,145	$ 50,222	$ 47,904	174,417			187,710	222,845
Gain (Loss) on Disposition of Business									0			19,835	0
Business reorganization									1,580			5,828	3,789
Impairment of long-lived assets									0			0	662
EBITDA (loss) (a)									(4,744)			6,820	(11,725)
Depreciation and amortization									3,090			3,845	5,559
Intercompany interest income (expense), net									0			0	0
Interest income (expense), net									(357)			(722)	(661)
Income (loss) from continuing operations before provision for income taxes									(8,191)			2,253	(17,945)
Provision for (benefit from) income taxes from continuing operations									742			646	(2,159)
Accounts receivable, net	58,517				62,420				58,517	$ 58,517	$ 58,517	62,420	74,079
Long-lived assets, net of accumulated depreciation and amortization	8,938				9,951				8,938	8,938	8,938	9,951	11,842
Total assets	101,812				124,949				101,812	101,812	101,812	124,949	139,672
Hudson Americas
Segment Reporting Information [Line Items]
Revenue, from external customers									15,561			28,627	50,146
Revenue from Related Parties									20			41	60
Total revenue									15,581			28,668	50,206
Gross margin, from external customers									13,609			16,111	20,757
Inter-segment gross margin									(14)			25	35
Gross margin									13,595			16,136	20,792
Gain (Loss) on Disposition of Business												15,918
Business reorganization									(39)			1,108	94
Impairment of long-lived assets													0
EBITDA (loss) (a)									770			13,354	117
Depreciation and amortization									49			604	485
Intercompany interest income (expense), net									0			0	0
Interest income (expense), net									0			(342)	(90)
Income (loss) from continuing operations before provision for income taxes									721			12,408	(458)
Provision for (benefit from) income taxes from continuing operations									30			58	(2,201)
Accounts receivable, net	2,507				3,155				2,507	2,507	2,507	3,155	6,695
Long-lived assets, net of accumulated depreciation and amortization	2				36				2	2	2	36	860
Total assets	5,880				7,766				5,880	5,880	5,880	7,766	10,553
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue, from external customers									236,839			219,391	246,873
Revenue from Related Parties									0			0	0
Total revenue									236,839			219,391	246,873
Gross margin, from external customers									84,126			89,682	93,014
Inter-segment gross margin									(271)			(477)	(143)
Gross margin									83,855			89,205	92,871
Gain (Loss) on Disposition of Business												0
Business reorganization									248			669	1,322
Impairment of long-lived assets													314
EBITDA (loss) (a)									(338)			2,851	(890)
Depreciation and amortization									1,744			1,951	3,287
Intercompany interest income (expense), net									0			0	0
Interest income (expense), net									(318)			(276)	(199)
Income (loss) from continuing operations before provision for income taxes									(2,400)			624	(4,376)
Provision for (benefit from) income taxes from continuing operations									(2,040)			776	11
Accounts receivable, net	32,271				29,824				32,271	32,271	32,271	29,824	26,745
Long-lived assets, net of accumulated depreciation and amortization	7,049				7,382				7,049	7,049	7,049	7,382	8,227
Total assets	51,331				49,246				51,331	51,331	51,331	49,246	54,141
Hudson Europe
Segment Reporting Information [Line Items]
Revenue, from external customers									170,344			215,179	284,173
Revenue from Related Parties									314			498	198
Total revenue									170,658			215,677	284,371
Gross margin, from external customers									76,682			81,917	109,074
Inter-segment gross margin									285			451	108
Gross margin									76,967			82,368	109,182
Gain (Loss) on Disposition of Business												3,917
Business reorganization									1,387			2,883	1,407
Impairment of long-lived assets													348
EBITDA (loss) (a)									1,064			(207)	(1,187)
Depreciation and amortization									892			802	1,247
Intercompany interest income (expense), net									(204)			(526)	(439)
Interest income (expense), net									(32)			(94)	(37)
Income (loss) from continuing operations before provision for income taxes									(64)			(1,629)	(2,910)
Provision for (benefit from) income taxes from continuing operations									2,761			(176)	35
Accounts receivable, net	23,739				29,441				23,739	23,739	23,739	29,441	40,639
Long-lived assets, net of accumulated depreciation and amortization	1,528				1,859				1,528	1,528	1,528	1,859	2,171
Total assets	40,790				53,557				40,790	40,790	40,790	53,557	65,105
Corporate
Segment Reporting Information [Line Items]
Revenue, from external customers									0			0	0
Revenue from Related Parties									0			0	0
Total revenue									0			0	0
Gross margin, from external customers									0			0	0
Inter-segment gross margin									0			0	0
Gross margin									0			0	0
Gain (Loss) on Disposition of Business												0
Business reorganization									(16)			1,168	966
Impairment of long-lived assets													0
EBITDA (loss) (a)									(6,240)			(9,178)	(9,765)
Depreciation and amortization									405			488	540
Intercompany interest income (expense), net									204			526	439
Interest income (expense), net									(7)			(10)	(335)
Income (loss) from continuing operations before provision for income taxes									(6,448)			(9,150)	(10,201)
Provision for (benefit from) income taxes from continuing operations									(9)			(12)	(4)
Accounts receivable, net	0				0				0	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	359				674				359	359	359	674	584
Total assets	3,811				14,380				3,811	3,811	3,811	14,380	9,873
Inter- segment elimination
Segment Reporting Information [Line Items]
Revenue, from external customers									0			0	0
Revenue from Related Parties									(334)			(539)	(258)
Total revenue									(334)			(539)	(258)
Gross margin, from external customers									0			0	0
Inter-segment gross margin									0			1	0
Gross margin									0			1	0
Gain (Loss) on Disposition of Business												0
Business reorganization									0			0	0
Impairment of long-lived assets													0
EBITDA (loss) (a)									0			0	0
Depreciation and amortization									0			0	0
Intercompany interest income (expense), net									0			0	0
Interest income (expense), net									0			0	0
Income (loss) from continuing operations before provision for income taxes									0			0	0
Provision for (benefit from) income taxes from continuing operations									0			0	0
Accounts receivable, net	0				0				0	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	0				0				0	0	0	0	0
Total assets	$ 0				$ 0				$ 0	$ 0	$ 0	$ 0	$ 0