QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 01, 2020	Jul. 01, 2019
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 59,966	$ 88,795	$ 95,342	$ 121,444	$ 140,688	$ 141,493	$ 196,535	$ 169,935	$ 365,547	$ 648,651	$ 838,202
Gross profit	4,551	16,225	12,714	26,863	35,083	30,771	43,821	45,720	60,353	155,395	216,037
Loss before income taxes and non-controlling interests	(3,695)	(11,140)	(33,747)	(9,124)	(8,459)	12,955	11,909	(3,966)	(57,706)	12,439	1,399
Net loss	(7,009)	(12,897)	(34,864)	(11,545)	(306,085)	7,576	(4,604)	(2,744)	(66,315)	(305,857)	(2,699)
Net loss attributable to Altisource	$ (7,208)	$ (13,237)	$ (35,061)	$ (11,650)	$ (306,106)	$ 7,165	$ (5,844)	$ (3,184)	$ (67,156)	$ (307,969)	$ (5,382)
Loss per share:
Basic (in dollars per share)	$ (0.46)	$ (0.85)	$ (2.25)	$ (0.75)	$ (19.66)	$ 0.45	$ (0.36)	$ (0.20)	$ (4.31)	$ (19.26)	$ (0.32)
Diluted (in dollars per share)	$ (0.46)	$ (0.85)	$ (2.25)	$ (0.75)	$ (19.66)	$ 0.44	$ (0.36)	$ (0.20)	$ (4.31)	$ (19.26)	$ (0.32)
Weighted average shares outstanding:
Basic (in shares)	15,657	15,637	15,601	15,497	15,568	15,897	16,214	16,292	15,598	15,991	17,073
Diluted (in shares)	15,657	15,637	15,601	15,497	15,568	16,151	16,214	16,292	15,598	15,991	17,073
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax provision									$ 8,609	$ 318,296	$ 4,098
Income tax expense, foreign income tax reserves					$ 5,600
Restructuring charges	$ 1,100	$ 2,200	$ 5,800	$ 2,900	5,000	$ 2,800	$ 1,900	$ 4,400	11,972	14,080	11,560
Severance		700
Gain on sale of business									0	17,814	13,688
Financial Services Business | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total proceeds from the sale of business													$ 44,000
Payment included in consideration, subject to working capital adjustment upon closing of the sale												$ 3,300	40,000
Additional payment to be received on one-year anniversary of the sale closing													$ 4,000
Gain on sale of business						17,600				17,800
Working capital adjustment					300
Owners.com | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment					5,200					5,200
Intangible asset impairment					700					700
Buy-Renovate-Lease-Sell Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of inventory							1,800
Altisource Residential Corporation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unrealized gain (loss) on investment in equity securities	16,400	100	$ (11,200)	$ (1,300)	2,700	(2,300)	11,800	2,200	4,000	14,400	(13,000)
Luxembourg
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Change in valuation for net operating loss carryforward					291,500
Change in statutory income tax rate					$ 1,700		$ 12,300
Sales Tax Exposure
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net reimbursement from third party						$ (1,700)
Loss (gain) related to sales tax exposure	$ (2,100)	$ (600)						$ 2,100	$ (2,700)	$ 300	$ 6,200