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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	May 15, 2018 $ / shares shares	Feb. 28, 2019 shares	Dec. 31, 2019 USD ($) vote component $ / shares shares	Dec. 31, 2018 USD ($) employee $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Jan. 01, 2018 USD ($)	Jan. 01, 2017 USD ($)	Dec. 31, 2016
Common Stock [Abstract]
Common stock, shares authorized (in shares)			100,000,000	100,000,000
Common stock, shares issued (in shares)			25,413,000	25,413,000
Common stock, shares outstanding (in shares)			15,454,000	16,276,000
Voting rights per share \| vote			1
Equity Incentive Plan [Abstract]
Maximum number of Altisource share-based awards that can be granted under the Plan (in shares)			6,700,000
Share-based awards available for future grants under the Plan (in shares)			800,000
Share Repurchase Program [Abstract]
Authorized amount (approximately) \| $			$ 102,000
Capacity available to repurchase common stock under senior secured term loan \| $			463,000
Share-Based Compensation [Abstract]
Share-based compensation expense \| $			11,900	$ 10,200	$ 4,300
Estimated unrecognized compensation costs \| $			$ 8,900
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized			1 year 6 months 7 days
Cumulative effect of an accounting change \| $						$ (10,448)	$ 0
Options outstanding (in shares)			1,468,046	1,440,566
Stock options granted, approximate (in shares)			227,849	277,000	244,000
Weighted average exercise price of stock options granted (in dollars per share) \| $ / shares			$ 24.98	$ 25.15	$ 33.28
Plan modification, number of stock options affected (in shares)				263,000
Plan modification, number of employees affected \| employee				16
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised
Weighted average fair value at grant date per share (in dollars per share) \| $ / shares			$ 0.00	$ 16.31	$ 20.44
Intrinsic value of options exercised \| $			$ 54	$ 4,609	$ 3,028
Grant date fair value of stock options that vested \| $			$ 3,053	$ 1,760	$ 2,279
Black-Scholes
Assumptions used to determine the fair value of options as of the grant date
Expected dividend yield				0.00%	0.00%
Binomial
Assumptions used to determine the fair value of options as of the grant date
Expected dividend yield				0.00%	0.00%
Minimum
Share-Based Compensation [Abstract]
Share based compensation arrangement by share based payment award estimated forfeiture rate								0.00%
Minimum \| Black-Scholes
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)				2.66%	1.89%
Expected stock price volatility (%)				70.31%	61.49%
Expected option life (in years)				6 years	6 years
Fair value (in usd per share) \| $ / shares				$ 16.17	$ 13.57
Minimum \| Binomial
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)				1.64%	0.77%
Expected stock price volatility (%)				71.36%	66.68%
Expected option life (in years)				2 years 6 months 22 days	2 years 6 months 18 days
Fair value (in usd per share) \| $ / shares				$ 14.67	$ 11.94
Maximum
Share-Based Compensation [Abstract]
Share based compensation arrangement by share based payment award estimated forfeiture rate								40.00%
Maximum \| Black-Scholes
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)				3.10%	2.29%
Expected stock price volatility (%)				71.86%	71.52%
Expected option life (in years)				6 years 3 months	7 years 6 months
Fair value (in usd per share) \| $ / shares				$ 19.68	$ 24.80
Maximum \| Binomial
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)				3.22%	2.38%
Expected stock price volatility (%)				71.86%	71.52%
Expected option life (in years)				4 years 3 months 29 days	4 years 9 months 26 days
Fair value (in usd per share) \| $ / shares				$ 20.26	$ 24.30
Stock Repurchase Program, Current
Share Repurchase Program [Abstract]
Number of shares of common stock authorized to be purchased (in shares)	4,300,000
Percentage of outstanding shares authorized to be repurchased	25.00%
Minimum purchase price authorized (in dollars per share) \| $ / shares	$ 1.00
Maximum purchase price authorized (in dollars per share) \| $ / shares	$ 500.00
Stock repurchase program, period in force	5 years
Remaining number of shares available for repurchase under the plan (in shares)			2,400,000
Stock Repurchase Programs
Share Repurchase Program [Abstract]
Number of shares of common stock purchased (in shares)			1,000,000	1,600,000	1,600,000
Average purchase price per share (in dollars per share) \| $ / shares			$ 20.33	$ 25.53	$ 23.84
Employee and non employee stock option
Share-Based Compensation [Abstract]
Performance criteria achieved (in shares)		228,000
Stock options granted, approximate (in shares)			0
Employee and non employee stock option \| Vesting Based on Service
Share-Based Compensation [Abstract]
Options outstanding (in shares)			426,000
Employee and non employee stock option \| Market-Based
Share-Based Compensation [Abstract]
Options outstanding (in shares)			578,000
Number of components of an award \| component			2
Allowable performance period before expiration date			3 years
Employee and non employee stock option \| Performance-Based, Vesting Period One
Share-Based Compensation [Abstract]
Award vesting rights, percentage			25.00%
Employee and non employee stock option \| Performance-Based, Vesting Period Two
Share-Based Compensation [Abstract]
Award vesting rights, percentage			25.00%
Employee and non employee stock option \| Performance-Based, Vesting Period Three
Share-Based Compensation [Abstract]
Award vesting rights, percentage			25.00%
Employee and non employee stock option \| Performance-Based, Vesting Period Four
Share-Based Compensation [Abstract]
Award vesting rights, percentage			25.00%
Employee and non employee stock option \| Performance-Based
Share-Based Compensation [Abstract]
Options outstanding (in shares)			464,000
Employee and non employee stock option \| Minimum \| Vesting Based on Service
Share-Based Compensation [Abstract]
Vesting period			3 years
Employee and non employee stock option \| Minimum \| Market-Based
Share-Based Compensation [Abstract]
Vesting period			3 years
Expiration term			10 years
Employee and non employee stock option \| Minimum \| Market-Based, Ordinary Performance
Share-Based Compensation [Abstract]
Percentage of compounded annual gain of stock price over exercise price required for the award to vest			20.00%
Employee and non employee stock option \| Minimum \| Market-Based, Extraordinary Performance
Share-Based Compensation [Abstract]
Percentage of compounded annual gain of stock price over exercise price required for the award to vest			25.00%
Employee and non employee stock option \| Minimum \| Performance-Based
Share-Based Compensation [Abstract]
Allowable performance period before expiration date			10 years
Attainment above threshold performance levels, vesting percentage			50.00%
Employee and non employee stock option \| Maximum \| Vesting Based on Service
Share-Based Compensation [Abstract]
Vesting period			4 years
Expiration term			10 years
Employee and non employee stock option \| Maximum \| Market-Based
Share-Based Compensation [Abstract]
Vesting period			4 years
Employee and non employee stock option \| Maximum \| Performance-Based
Share-Based Compensation [Abstract]
Attainment above threshold performance levels, vesting percentage			200.00%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period One
Share-Based Compensation [Abstract]
Award vesting rights, percentage			33.00%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period Two
Share-Based Compensation [Abstract]
Award vesting rights, percentage			33.00%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period Three
Share-Based Compensation [Abstract]
Award vesting rights, percentage			33.00%
Restricted Shares and Restricted Share Units \| Minimum \| Vesting Based on Service
Share-Based Compensation [Abstract]
Vesting period			2 years
Restricted Shares and Restricted Share Units \| Maximum \| Vesting Based on Service
Share-Based Compensation [Abstract]
Vesting period			4 years
Restricted Shares and Restricted Share Units \| Maximum \| Performance-Based
Share-Based Compensation [Abstract]
Attainment above threshold performance levels, vesting percentage			225.00%
Retained earnings
Share-Based Compensation [Abstract]
Cumulative effect of an accounting change \| $						$ (9,715)	(932)
Retained earnings \| Accounting Standards Update 2016-09 [Member]
Share-Based Compensation [Abstract]
Cumulative effect of an accounting change \| $							(900)
Additional paid-in capital
Share-Based Compensation [Abstract]
Cumulative effect of an accounting change \| $							932
Additional paid-in capital \| Accounting Standards Update 2016-09 [Member]
Share-Based Compensation [Abstract]
Cumulative effect of an accounting change \| $							$ 900