SEGMENT AND GEOGRAPHIC DATA Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segments	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Number of Reportable Segments	3
Revenue, from external customers	$ 124,317	$ 144,167
Inter-segment revenue	0	0
Total revenue	124,317	144,167
Gross margin, from external customers	47,904	54,029
Inter-segment gross margin	0	0
Gross margin	47,904	54,029
Business reorganization expenses	1,343	114
EBITDA (loss)	(5,592)	(2,200)
Depreciation and amortization	1,111	1,371
Intercompany interest income (expense), net	0	0
Interest income (expense), net	(80)	(139)
Income (loss) from continuing operation before provision for income taxes	(6,783)	(3,710)
Accounts receivable, net	79,509	98,820	74,079
Long-lived assets, net of accumulated depreciation and amortization	10,897	14,268
Total assets	121,171	159,499	139,672
Hudson Americas
Segment Reporting Information [Line Items]
Revenue, from external customers	10,978	12,244
Inter-segment revenue	0	0
Total revenue	10,978	12,244
Gross margin, from external customers	4,621	4,502
Inter-segment gross margin	(7)	(3)
Gross margin	4,614	4,499
Business reorganization expenses	421	91
EBITDA (loss)	(1,620)	(456)
Depreciation and amortization	102	119
Intercompany interest income (expense), net	0	0
Interest income (expense), net	(33)	(2)
Income (loss) from continuing operation before provision for income taxes	(1,755)	(577)
Accounts receivable, net	6,934	16,494
Long-lived assets, net of accumulated depreciation and amortization	535	588
Total assets	9,423	19,688
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue, from external customers	53,139	56,430
Inter-segment revenue	0	0
Total revenue	53,139	56,430
Gross margin, from external customers	20,876	20,911
Inter-segment gross margin	(31)	(70)
Gross margin	20,845	20,841
Business reorganization expenses	8	0
EBITDA (loss)	804	(305)
Depreciation and amortization	671	745
Intercompany interest income (expense), net	0	0
Interest income (expense), net	(42)	(42)
Income (loss) from continuing operation before provision for income taxes	91	(1,092)
Accounts receivable, net	31,957	31,258
Long-lived assets, net of accumulated depreciation and amortization	7,300	9,550
Total assets	49,300	58,223
Hudson Europe
Segment Reporting Information [Line Items]
Revenue, from external customers	60,200	75,493
Inter-segment revenue	14	78
Total revenue	60,214	75,571
Gross margin, from external customers	22,407	28,616
Inter-segment gross margin	37	73
Gross margin	22,444	28,689
Business reorganization expenses	880	23
EBITDA (loss)	(2,150)	688
Depreciation and amortization	228	345
Intercompany interest income (expense), net	(130)	(130)
Interest income (expense), net	(5)	11
Income (loss) from continuing operation before provision for income taxes	(2,513)	224
Accounts receivable, net	40,618	51,068
Long-lived assets, net of accumulated depreciation and amortization	2,073	3,528
Total assets	58,811	76,718
Corporate
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0
Inter-segment revenue	0	0
Total revenue	0	0
Gross margin, from external customers	0	0
Inter-segment gross margin	0	0
Gross margin	0	0
Business reorganization expenses	34	0
EBITDA (loss)	(2,626)	(2,127)
Depreciation and amortization	110	162
Intercompany interest income (expense), net	134	130
Interest income (expense), net	0	(106)
Income (loss) from continuing operation before provision for income taxes	(2,602)	(2,265)
Accounts receivable, net	0	0
Long-lived assets, net of accumulated depreciation and amortization	989	602
Total assets	3,637	4,870
Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0
Inter-segment revenue	(14)	(78)
Total revenue	(14)	(78)
Gross margin, from external customers	0	0
Inter-segment gross margin	1	0
Gross margin	1	0
Business reorganization expenses	0	0
EBITDA (loss)	0	0
Depreciation and amortization	0	0
Intercompany interest income (expense), net	(4)	0
Interest income (expense), net	0	0
Income (loss) from continuing operation before provision for income taxes	(4)	0
Accounts receivable, net	0	0
Long-lived assets, net of accumulated depreciation and amortization	0	0
Total assets	$ 0	$ 0