SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 106,109	$ 110,028	$ 122,743	$ 124,317	$ 136,677	$ 149,278	$ 151,070	$ 144,167	$ 463,197	$ 581,192	$ 562,572
Long-lived assets, net of accumulated depreciation and amortization	9,951				11,842				9,951	11,842	14,040
Total assets	124,949				139,672				124,949	139,672	158,829
Net assets	61,180				59,257				61,180	59,257	74,385	$ 106,541
Hudson Americas
Segment Reporting Information [Line Items]
Revenue									28,668	50,206	51,855
Long-lived assets, net of accumulated depreciation and amortization	36				860				36	860	604
Total assets	7,766				10,553				7,766	10,553	18,338
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue									219,391	246,873	232,748
Long-lived assets, net of accumulated depreciation and amortization	7,382				8,227				7,382	8,227	9,179
Total assets	49,246				54,141				49,246	54,141	55,234
Hudson Europe
Segment Reporting Information [Line Items]
Revenue									215,677	284,371	278,074
Long-lived assets, net of accumulated depreciation and amortization	1,859				2,171				1,859	2,171	3,494
Total assets	53,557				65,105				53,557	65,105	74,877
Corporate
Segment Reporting Information [Line Items]
Revenue									0	0	0
Long-lived assets, net of accumulated depreciation and amortization	674				584				674	584	763
Total assets	14,380				9,873				14,380	9,873	10,380
Inter- segment elimination
Segment Reporting Information [Line Items]
Revenue									(539)	(258)	(105)
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									154,931	181,155	180,084
Long-lived assets, net of accumulated depreciation and amortization	1,707				1,834				1,707	1,834	2,891
Net assets	17,371				18,894				17,371	18,894	21,479
Australia
Segment Reporting Information [Line Items]
Revenue									159,539	184,853	169,998
Long-lived assets, net of accumulated depreciation and amortization	4,115				5,404				4,115	5,404	5,838
Net assets	9,920				13,913				9,920	13,913	18,938
United States
Segment Reporting Information [Line Items]
Revenue									27,965	49,375	50,859
Long-lived assets, net of accumulated depreciation and amortization	718				1,429				718	1,429	1,337
Net assets	13,467				7,255				13,467	7,255	15,819
Continental Europe
Segment Reporting Information [Line Items]
Revenue									60,248	103,018	97,883
Long-lived assets, net of accumulated depreciation and amortization	144				330				144	330	594
Net assets	7,176				9,366				7,176	9,366	7,169
Other Asia Pacific
Segment Reporting Information [Line Items]
Revenue									59,852	62,020	62,750
Long-lived assets, net of accumulated depreciation and amortization	3,267				2,822				3,267	2,822	3,341
Net assets	13,261				9,772				13,261	9,772	10,791
Other Americas
Segment Reporting Information [Line Items]
Revenue									662	771	998
Long-lived assets, net of accumulated depreciation and amortization	0				23				0	23	39
Net assets	$ (15)				$ 57				$ (15)	$ 57	$ 189