SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 100,314	$ 108,136	$ 113,067	$ 101,227	$ 106,109	$ 110,028	$ 122,743	$ 124,317	$ 422,744	$ 463,197	$ 581,192
Long-lived assets, net of accumulated depreciation and amortization	8,938				9,951				8,938	9,951	11,842
Total assets	101,812				124,949				101,812	124,949	139,672
Net assets	41,885				61,180				41,885	61,180	59,257	$ 74,385
Hudson Americas
Segment Reporting Information [Line Items]
Revenue									15,581	28,668	50,206
Long-lived assets, net of accumulated depreciation and amortization	2				36				2	36	860
Total assets	5,880				7,766				5,880	7,766	10,553
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue									236,839	219,391	246,873
Long-lived assets, net of accumulated depreciation and amortization	7,049				7,382				7,049	7,382	8,227
Total assets	51,331				49,246				51,331	49,246	54,141
Hudson Europe
Segment Reporting Information [Line Items]
Revenue									170,658	215,677	284,371
Long-lived assets, net of accumulated depreciation and amortization	1,528				1,859				1,528	1,859	2,171
Total assets	40,790				53,557				40,790	53,557	65,105
Corporate
Segment Reporting Information [Line Items]
Revenue									0	0	0
Long-lived assets, net of accumulated depreciation and amortization	359				674				359	674	584
Total assets	3,811				14,380				3,811	14,380	9,873
Inter- segment elimination
Segment Reporting Information [Line Items]
Revenue									(334)	(539)	(258)
Long-lived assets, net of accumulated depreciation and amortization	0				0				0	0	0
Total assets	0				0				0	0	0
United Kingdom
Segment Reporting Information [Line Items]
Revenue									116,508	154,931	181,155
Long-lived assets, net of accumulated depreciation and amortization	1,259				1,707				1,259	1,707	1,834
Net assets	9,101				17,371				9,101	17,371	18,894
Australia
Segment Reporting Information [Line Items]
Revenue									181,899	159,539	184,853
Long-lived assets, net of accumulated depreciation and amortization	4,023				4,115				4,023	4,115	5,404
Net assets	10,732				9,920				10,732	9,920	13,913
CHINA
Segment Reporting Information [Line Items]
Revenue									16,203	25,401	20,976
Long-lived assets, net of accumulated depreciation and amortization	2,381				2,835				2,381	2,835	2,186
Net assets	5,762				9,386				5,762	9,386	6,198
United States
Segment Reporting Information [Line Items]
Revenue									14,690	27,965	49,375
Long-lived assets, net of accumulated depreciation and amortization	369				718				369	718	1,429
Net assets	4,854				13,467				4,854	13,467	7,255
Continental Europe
Segment Reporting Information [Line Items]
Revenue									53,837	60,248	103,018
Long-lived assets, net of accumulated depreciation and amortization	261				144				261	144	330
Net assets	7,284				7,176				7,284	7,176	9,366
Other Asia Pacific
Segment Reporting Information [Line Items]
Revenue									38,737	34,451	41,044
Long-lived assets, net of accumulated depreciation and amortization	645				432				645	432	636
Net assets	4,279				3,875				4,279	3,875	3,574
Other Americas
Segment Reporting Information [Line Items]
Revenue									870	662	771
Long-lived assets, net of accumulated depreciation and amortization	0				0				0	0	23
Net assets	$ (127)				$ (15)				$ (127)	$ (15)	$ 57