BUSINESS REORGANIZATION EXPENSES EMPLOYMENT TERMINATION BENEFITS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Business reorganization	$ 712	$ 1,580	$ 5,828
Hudson Americas
Restructuring Cost and Reserve [Line Items]
Business reorganization	(82)	(39)	1,108
Hudson Asia Pacific
Restructuring Cost and Reserve [Line Items]
Business reorganization	1	248	669
Hudson Europe
Restructuring Cost and Reserve [Line Items]
Business reorganization	815	1,387	2,883
Corporate
Restructuring Cost and Reserve [Line Items]
Business reorganization	(22)	(16)	1,168
One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Business reorganization	(11)	316	2,109
One-time Termination Benefits | Hudson Americas
Restructuring Cost and Reserve [Line Items]
Business reorganization	23	(8)	350
One-time Termination Benefits | Hudson Asia Pacific
Restructuring Cost and Reserve [Line Items]
Business reorganization	0	273	(2)
One-time Termination Benefits | Hudson Europe
Restructuring Cost and Reserve [Line Items]
Business reorganization	(12)	77	792
One-time Termination Benefits | Corporate
Restructuring Cost and Reserve [Line Items]
Business reorganization	$ (22)	$ (26)	$ 969