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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Details) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($) shares	May 15, 2018 $ / shares shares	Feb. 28, 2019 shares	Apr. 30, 2018	Dec. 31, 2020 USD ($) vote component $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) employee $ / shares shares
Common Stock [Abstract]
Common stock, shares authorized (in shares)	100,000,000.0				100,000,000.0	100,000,000.0
Common stock, shares issued (in shares)	25,413,000				25,413,000	25,413,000
Common stock, shares outstanding (in shares)	15,664,000				15,664,000	15,454,000
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				6,700,000
Share-based awards available for future grants under the Plan (in shares)	1,000,000.0				1,000,000.0
Share Repurchase Program [Abstract]
Authorized amount (approximately) \| $	$ 91,000				$ 91,000
Capacity available to repurchase common stock under senior secured term loan \| $	430,000				430,000
Share-Based Compensation [Abstract]
Share-based compensation expense \| $					7,800	$ 11,900	$ 10,200
Estimated unrecognized compensation costs \| $	$ 6,600				$ 6,600
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized					1 year 5 months 23 days
Options outstanding (in shares)	899,914				899,914	1,468,046
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	$ 0	$ 16.31
Intrinsic value of options exercised \| $					$ 0	$ 54	$ 4,609
Grant date fair value of stock options that vested \| $					$ 2,730	$ 3,053	$ 1,760
Term B Loans
Share Repurchase Program [Abstract]
Covenant threshold, leverage ratio	3.50			3.50	3.50
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				2,400,000
Stock Repurchase Programs
Share Repurchase Program [Abstract]
Number of shares of common stock purchased (in shares)					0	1,000,000.0	1,600,000
Average purchase price per share (in dollars per share) \| $ / shares						$ 20.33	$ 25.53
Stock Options
Share-Based Compensation [Abstract]
Performance criteria achieved (in shares)			228,000
Stock options granted, approximate (in shares)					0	0	277,000
Weighted average exercise price of stock options granted (in dollars per share) \| $ / shares							$ 25.15
Stock Options \| Black-Scholes
Assumptions used to determine the fair value of options as of the grant date
Expected dividend yield							0.00%
Stock Options \| Binomial
Assumptions used to determine the fair value of options as of the grant date
Expected dividend yield							0.00%
Stock Options \| Minimum \| Black-Scholes
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)							2.66%
Expected stock price volatility (%)							70.31%
Expected option life (in years)							6 years
Fair value (in usd per share) \| $ / shares							$ 16.17
Stock Options \| Minimum \| Binomial
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)							1.64%
Expected stock price volatility (%)							71.36%
Expected option life (in years)							2 years 6 months 21 days
Fair value (in usd per share) \| $ / shares							$ 14.67
Stock Options \| Maximum \| Black-Scholes
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)							3.10%
Expected stock price volatility (%)							71.86%
Expected option life (in years)							6 years 3 months
Fair value (in usd per share) \| $ / shares							$ 19.68
Stock Options \| Maximum \| Binomial
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)							3.22%
Expected stock price volatility (%)							71.86%
Expected option life (in years)							4 years 3 months 29 days
Fair value (in usd per share) \| $ / shares							$ 20.26
Stock Options, Service-Based
Share-Based Compensation [Abstract]
Options outstanding (in shares)	253,000				253,000
Stock Options, Service-Based \| Minimum
Share-Based Compensation [Abstract]
Vesting period					3 years
Stock Options, Service-Based \| Maximum
Share-Based Compensation [Abstract]
Vesting period					4 years
Expiration term					10 years
Stock Options, Market-Based
Share-Based Compensation [Abstract]
Options outstanding (in shares)	201,000				201,000
Number of components of an award \| component					2
Allowable performance period before expiration date					3 years
Stock Options, Market-Based \| Minimum
Share-Based Compensation [Abstract]
Vesting period					3 years
Expiration term					10 years
Stock Options, Market-Based \| Maximum
Share-Based Compensation [Abstract]
Vesting period					4 years
Stock Options, Market-Based, Ordinary Performance
Share-Based Compensation [Abstract]
Percentage of awards	67.00%				67.00%
Vesting threshold	2				2
Stock Options, Market-Based, Ordinary Performance \| Minimum
Share-Based Compensation [Abstract]
Percentage of compounded annual gain of stock price over exercise price required for the award to vest					20.00%
Stock Options, Market-Based, Extraordinary Performance
Share-Based Compensation [Abstract]
Percentage of awards	33.00%				33.00%
Stock Options, Market-Based, Extraordinary Performance \| Minimum
Share-Based Compensation [Abstract]
Percentage of compounded annual gain of stock price over exercise price required for the award to vest					25.00%
Stock Options, Performance-Based
Share-Based Compensation [Abstract]
Options outstanding (in shares)	446,000				446,000
Stock Options, Performance-Based \| Share-based Payment Arrangement, Tranche One
Share-Based Compensation [Abstract]
Award vesting rights, percentage					25.00%
Stock Options, Performance-Based \| Share-based Payment Arrangement, Tranche Two
Share-Based Compensation [Abstract]
Award vesting rights, percentage					25.00%
Stock Options, Performance-Based \| Share-based Payment Arrangement, Tranche Three
Share-Based Compensation [Abstract]
Award vesting rights, percentage					25.00%
Stock Options, Performance-Based \| Share-based Payment Arrangement, Tranche Four
Share-Based Compensation [Abstract]
Award vesting rights, percentage					25.00%
Stock Options, Performance-Based \| Minimum
Share-Based Compensation [Abstract]
Allowable performance period before expiration date					10 years
Attainment above threshold performance levels, vesting percentage					50.00%
Stock Options, Performance-Based \| Maximum
Share-Based Compensation [Abstract]
Attainment above threshold performance levels, vesting percentage					200.00%