LOSS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss attributable to Altisource	$ (18,269)	$ (13,237)	$ (58,746)	$ (59,948)
Weighted average common shares outstanding, basic (in shares)	15,831	15,637	15,816	15,578
Weighted average common shares outstanding, diluted (in shares)	15,831	15,637	15,816	15,578
Loss per share:
Basic (in usd per share)	$ (1.15)	$ (0.85)	$ (3.71)	$ (3.85)
Diluted (in usd per share)	$ (1.15)	$ (0.85)	$ (3.71)	$ (3.85)
Anti-dilutive securities
Options, restricted shares and restricted share units excluded from the computation of diluted EPS (in shares)	1,300	1,400	1,500	1,600
Employee and Nonemployee Stock Options, Restricted Stock and Restricted Stock Units Whose Impacts are Anti-Dilutive
Anti-dilutive securities
Options, restricted shares and restricted share units excluded from the computation of diluted EPS (in shares)	200	200	200	200
Options Whose Exercise Price is Greater than Average Market Price
Anti-dilutive securities
Options, restricted shares and restricted share units excluded from the computation of diluted EPS (in shares)	300	300	300	500
Options and Restricted Shares Issuable upon Achievement of Certain Market and Performance Criteria That Has Not Been Met
Anti-dilutive securities
Options, restricted shares and restricted share units excluded from the computation of diluted EPS (in shares)	1,000	900	800	900