LOSS PER SHARE (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
Earnings Per Share [Abstract]
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)
Weighted average common 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
Weighted average common shares outstanding, 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
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)
Anti-dilutive securities
Excluded from the computation of diluted EPS (in shares)									1,600	1,600	1,200
Options, Restricted Stock and Restricted Stock Units Whose Impacts are Anti-Dilutive Because of Net Loss
Anti-dilutive securities
Excluded from the computation of diluted EPS (in shares)									200	300	500
Options Whose Exercise Price is Greater than Average Market Price
Anti-dilutive securities
Excluded from the computation of diluted EPS (in shares)									500	500	300
Options, Restricted Shares and Restricted Share Units Issuable upon Achievement of Certain Market and Performance Criteria That Has Not Been Met
Anti-dilutive securities
Excluded from the computation of diluted EPS (in shares)									900	800	500