SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue	$ 136,677		$ 149,278	$ 151,070	$ 144,167	$ 139,999		$ 139,287	$ 145,383	$ 137,903	$ 581,192	[1]	$ 562,572	[1]	$ 655,875	[1]
Long-lived assets, net of accumulated depreciation and amortization	11,842	[2]				14,040	[2]				11,842	[2]	14,040	[2]	19,556	[2]
Total assets	139,672					158,829					139,672		158,829		193,468
Net assets	59,257					74,385					59,257		74,385		106,541		107,357
Hudson Americas
Segment Reporting Information [Line Items]
Revenue											50,206		51,855		60,015
Long-lived assets, net of accumulated depreciation and amortization	860					604					860		604		966
Total assets	10,553					18,338					10,553		18,338		31,399
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue											246,873		232,748		288,261
Long-lived assets, net of accumulated depreciation and amortization	8,227					9,179					8,227		9,179		12,909
Total assets	54,141					55,234					54,141		55,234		72,517
Hudson Europe
Segment Reporting Information [Line Items]
Revenue											284,371		278,074		307,802
Long-lived assets, net of accumulated depreciation and amortization	2,171					3,494					2,171		3,494		5,046
Total assets	65,105					74,877					65,105		74,877		76,381
Corporate
Segment Reporting Information [Line Items]
Revenue											0		0		0
Long-lived assets, net of accumulated depreciation and amortization	584					763					584		763		635
Total assets	9,873					10,380					9,873		10,380		13,171
Inter- segment elimination
Segment Reporting Information [Line Items]
Revenue											(258)		(105)		(203)
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											181,155	[1]	180,084	[1]	201,205	[1]
Long-lived assets, net of accumulated depreciation and amortization	1,834	[2]				2,890	[2]				1,834	[2]	2,890	[2]	3,629	[2]
Net assets	18,894					21,479					18,894		21,479		26,750
Australia
Segment Reporting Information [Line Items]
Revenue											184,853	[1]	169,998	[1]	218,537	[1]
Long-lived assets, net of accumulated depreciation and amortization	5,404	[2]				5,838	[2]				5,404	[2]	5,838	[2]	9,015	[2]
Net assets	13,913					18,938					13,913		18,938		31,036
United States
Segment Reporting Information [Line Items]
Revenue											49,375	[1]	50,859	[1]	57,994	[1]
Long-lived assets, net of accumulated depreciation and amortization	1,429	[2]				1,338	[2]				1,429	[2]	1,338	[2]	1,552	[2]
Net assets	7,255					15,819					7,255		15,819		26,404
Continental Europe
Segment Reporting Information [Line Items]
Revenue											103,018	[1]	97,883	[1]	106,327	[1]
Long-lived assets, net of accumulated depreciation and amortization	330	[2]				593	[2]				330	[2]	593	[2]	1,409	[2]
Net assets	9,366					7,169					9,366		7,169		7,975
Other Asia Pacific
Segment Reporting Information [Line Items]
Revenue											62,020	[1]	62,750	[1]	69,791	[1]
Long-lived assets, net of accumulated depreciation and amortization	2,823	[2]				3,341	[2]				2,823	[2]	3,341	[2]	3,895	[2]
Net assets	9,772					10,791					9,772		10,791		14,122
Other Americas
Segment Reporting Information [Line Items]
Revenue											771	[1]	998	[1]	2,021	[1]
Long-lived assets, net of accumulated depreciation and amortization	22	[2]				40	[2]				22	[2]	40	[2]	56	[2]
Net assets	$ 57					$ 189					$ 57		$ 189		$ 254

[1] Revenue by geographic region disclosed above is net of any inter-segment revenue and, therefore, represents only revenue from external customers according to the location of the operating subsidiary.

[2] Comprised of property and equipment and goodwill, net of accumulated depreciation and amortization. Corporate assets are included in the United States.