SEGMENT AND GEOGRAPHIC DATA - Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Segment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			3
Revenue, from external customers	$ 44,897	$ 56,723	$ 87,969	$ 108,640
Inter-segment revenue	0	0	0	0
Revenue	44,897	56,723	87,969	108,640
Adjusted net revenue, from external customers	22,583	27,274	44,347	52,847
Inter-segment adjusted net revenue	0	0	0	0
Total adjusted net revenue	22,583	27,274	44,347	52,847
EBITDA (loss)	1,659	4,208	2,158	8,085
Depreciation and amortization	(354)	(337)	(702)	(661)
Intercompany dividend/interest (expense) income, net	0	0	0	0
Interest income, net	130	3	194	5
Income before income taxes	1,435	3,874	1,650	7,429
Provision for income taxes	(857)	(781)	(718)	(1,317)
Net income	578	3,093	932	6,112
Accounts receivable, net	27,462	26,270	27,462	26,270	$ 26,270
Long-lived assets, net of accumulated depreciation and amortization	9,408	10,064	9,408	10,064
Total assets	65,746	67,942	65,746	67,942	$ 67,942
Inter-Segment Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(102)	(53)	(87)	(149)
Revenue	(102)	(53)	(87)	(149)
Adjusted net revenue, from external customers	0	0	0	0
Inter-segment adjusted net revenue	(29)	4	(26)	4
Total adjusted net revenue	(29)	4	(26)	4
EBITDA (loss)	0	0	0	0
Depreciation and amortization	0	0	0	0
Intercompany dividend/interest (expense) income, net	(1,218)	(2,433)	(1,218)	(2,433)
Interest income, net	0	0	0	0
Provision for income taxes	0	0	0	0
Net income	(1,218)	(2,433)	(1,218)	(2,433)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	0	0	0	0
Total assets	0	0	0	0
Hudson Americas | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	8,569	14,415	17,841	29,026
Inter-segment revenue	102	46	111	99
Revenue	8,671	14,461	17,952	29,125
Adjusted net revenue, from external customers	8,321	13,809	17,243	27,511
Inter-segment adjusted net revenue	102	45	111	61
Total adjusted net revenue	8,423	13,854	17,354	27,572
EBITDA (loss)	(466)	2,291	(896)	4,705
Depreciation and amortization	(312)	(321)	(623)	(626)
Intercompany dividend/interest (expense) income, net	0	0	0	0
Interest income, net	0	0	0	0
Provision for income taxes	(73)	(26)	155	(68)
Net income	(851)	1,944	(1,364)	4,011
Accounts receivable, net	7,478	9,015	7,478	9,015
Long-lived assets, net of accumulated depreciation and amortization	8,431	9,027	8,431	9,027
Total assets	20,668	23,775	20,668	23,775
Hudson Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	28,402	29,944	55,678	61,077
Inter-segment revenue	0	0	0	12
Revenue	28,402	29,944	55,678	61,089
Adjusted net revenue, from external customers	9,581	9,174	18,040	17,387
Inter-segment adjusted net revenue	(58)	(45)	(38)	(53)
Total adjusted net revenue	9,523	9,129	18,002	17,334
EBITDA (loss)	2,131	2,262	3,565	4,289
Depreciation and amortization	(32)	(9)	(59)	(20)
Intercompany dividend/interest (expense) income, net	(127)	(81)	(247)	(156)
Interest income, net	2	1	4	2
Provision for income taxes	(552)	(544)	(920)	(1,075)
Net income	1,422	1,629	2,343	3,040
Accounts receivable, net	14,069	10,900	14,069	10,900
Long-lived assets, net of accumulated depreciation and amortization	915	963	915	963
Total assets	25,170	23,662	25,170	23,662
Hudson Europe | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	7,926	12,364	14,450	18,537
Inter-segment revenue	0	7	(24)	38
Revenue	7,926	12,371	14,426	18,575
Adjusted net revenue, from external customers	4,681	4,291	9,064	7,949
Inter-segment adjusted net revenue	(15)	(4)	(47)	(12)
Total adjusted net revenue	4,666	4,287	9,017	7,937
EBITDA (loss)	851	551	1,295	698
Depreciation and amortization	(8)	(6)	(15)	(13)
Intercompany dividend/interest (expense) income, net	1,218	1,214	1,218	1,214
Interest income, net	0	0	0	0
Provision for income taxes	(299)	(92)	(413)	(76)
Net income	1,762	1,667	2,085	1,823
Accounts receivable, net	5,915	6,355	5,915	6,355
Long-lived assets, net of accumulated depreciation and amortization	43	49	43	49
Total assets	11,268	9,568	11,268	9,568
Corporate Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	0	0	0	0
Revenue	0	0	0	0
Adjusted net revenue, from external customers	0	0	0	0
Inter-segment adjusted net revenue	0	0	0	0
Total adjusted net revenue	0	0	0	0
EBITDA (loss)	(857)	(896)	(1,806)	(1,607)
Depreciation and amortization	(2)	(1)	(5)	(2)
Intercompany dividend/interest (expense) income, net	127	1,300	247	1,375
Interest income, net	128	2	190	3
Provision for income taxes	67	(119)	460	(98)
Net income	(537)	286	(914)	(329)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	19	25	19	25
Total assets	$ 8,640	$ 10,937	$ 8,640	$ 10,937