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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	May 17, 2017 $ / shares shares	Dec. 31, 2018 USD ($) vote component $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Jan. 01, 2018 USD ($)	Jan. 01, 2017 USD ($)
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)		16,276,000	17,418,000
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)		6,700,000.0
Share-based awards available for future grants under the Plan (in shares)		1,200,000
Share Repurchase Program [Abstract]
Authorized amount (approximately) \| $		$ 139,000
Capacity available to repurchase common stock under senior secured term loan \| $		489,000
Share-Based Compensation [Abstract]
Share-based compensation expense \| $		10,200	$ 4,300	$ 6,200
Estimated unrecognized compensation costs (in dollars) \| $		$ 11,800
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized		1 year 10 months 24 days
Cumulative effect (decrease) increase of an accounting change \| $					$ (10,448)	$ 0
Options outstanding (in shares)		1,440,566	1,745,906
Stock options granted, approximate (in shares)		276,876	244,000	145,000
Weighted average exercise price of stock options granted (in dollars per share) \| $ / shares		$ 25.15	$ 33.28	$ 29.17
Plan modification, number of stock options affected (in shares)		263,000
Plan modification, number of employees affected		16
Assumptions used to determine the fair value of options as of the grant date
Expected dividend yield		0.00%	0.00%	0.00%
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		$ 16.31	$ 20.44	$ 16.82
Intrinsic value of stock options exercised \| $		$ 4,609	$ 3,028	$ 18,209
Grant date fair value of stock options that vested \| $		$ 1,760	$ 2,279	$ 2,698
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%	1.25%
Expected stock price volatility (%)		70.31%	61.49%	59.75%
Expected option life (in years)		6 years	6 years	6 years
Fair value (in usd per share) \| $ / shares		$ 16.17	$ 13.57	$ 11.15
Minimum \| Binomial
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)		1.64%	0.77%	0.23%
Expected stock price volatility (%)		71.36%	66.68%	59.76%
Expected option life (in years)		2 years 6 months 22 days	2 years 6 months 18 days	4 years 22 days
Fair value (in usd per share) \| $ / shares		$ 14.67	$ 11.94	$ 11.06
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%	1.89%
Expected stock price volatility (%)		71.86%	71.52%	62.14%
Expected option life (in years)		6 years 3 months	7 years 6 months	6 years 3 months
Fair value (in usd per share) \| $ / shares		$ 19.68	$ 24.80	$ 18.60
Maximum \| Binomial
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)		3.22%	2.38%	2.23%
Expected stock price volatility (%)		71.86%	71.52%	62.14%
Expected option life (in years)		4 years 3 months 29 days	4 years 9 months 26 days	4 years 10 months 17 days
Fair value (in usd per share) \| $ / shares		$ 20.26	$ 24.30	$ 19.27
Stock Repurchase Program, Current
Share Repurchase Program [Abstract]
Number of shares of common stock authorized to be purchased	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)		3,400,000
Stock Repurchase Programs
Share Repurchase Program [Abstract]
Number of shares of common stock purchased (in shares)		1,600,000	1,600,000	1,400,000
Average purchase price per share (in dollars per share) \| $ / shares		$ 25.53	$ 23.84	$ 26.81
Employee and non employee stock option \| Performance-Based, Vesting Period One
Share-Based Compensation [Abstract]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage		33.00%
Employee and non employee stock option \| Performance-Based, Vesting Period Two
Share-Based Compensation [Abstract]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage		33.00%
Employee and non employee stock option \| Performance-Based, Vesting Period Three
Share-Based Compensation [Abstract]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage		33.00%
Employee and non employee stock option \| Vesting Based on Service
Share-Based Compensation [Abstract]
Options outstanding (in shares)		500,000
Employee and non employee stock option \| Market-Based
Share-Based Compensation [Abstract]
Options outstanding (in shares)		662,000
Number of components of an award \| component		2
Allowable performance period before expiration date		3 years
Employee and non employee stock option \| Performance-Based
Share-Based Compensation [Abstract]
Options outstanding (in shares)		279,000
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]
Attainment above threshold performance levels, vesting percentage		50.00%
Allowable performance period before expiration date		10 years
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]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage		33.00%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period Two
Share-Based Compensation [Abstract]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage		33.00%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period Three
Share-Based Compensation [Abstract]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage		33.00%
Restricted Shares and Restricted Share Units \| Minimum \| Vesting Based on Service
Share-Based Compensation [Abstract]
Vesting period		1 year
Restricted Shares and Restricted Share Units \| Minimum \| Performance-Based
Share-Based Compensation [Abstract]
Attainment above threshold performance levels, vesting percentage		80.00%
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		150.00%
Retained earnings
Share-Based Compensation [Abstract]
Cumulative effect (decrease) increase of an accounting change \| $					$ (9,715)	(932)
Retained earnings \| Accounting Standards Update 2016-09
Share-Based Compensation [Abstract]
Cumulative effect (decrease) increase of an accounting change \| $						(900)
Additional paid-in capital
Share-Based Compensation [Abstract]
Cumulative effect (decrease) increase of an accounting change \| $						932
Additional paid-in capital \| Accounting Standards Update 2016-09
Share-Based Compensation [Abstract]
Cumulative effect (decrease) increase of an accounting change \| $						$ 900