SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018 USD ($)		Sep. 30, 2018 USD ($)	[1],[2],[3],[4],[5],[6],[7]	Jun. 30, 2018 USD ($)	[1],[2],[3],[4],[5],[6],[7]	Mar. 31, 2018 USD ($)	[1],[2],[3],[4],[5],[6],[7]	Dec. 31, 2017 USD ($)		Sep. 30, 2017 USD ($)	[7],[8]	Jun. 30, 2017 USD ($)	[7],[8]	Mar. 31, 2017 USD ($)	[7],[8]	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 19, 2017 USD ($)
SEGMENT REPORTING
Revenue	$ 217,633	[1],[2],[3],[4],[5],[6],[7]	$ 204,575		$ 218,556		$ 197,438		$ 216,066	[7],[8]	$ 234,979		$ 250,685		$ 240,483		$ 838,202	$ 942,213	$ 997,303
Cost of revenue																	622,165	699,865	690,045
Gross profit	53,448	[1],[2],[3],[4],[5],[6],[7]	56,995		55,350		50,244		54,445	[7],[8]	60,081		65,292		62,530		216,037	242,348	307,258
Selling, general and administrative expenses																	175,670	192,642	214,155
Gain on sale of business																	(13,688)	0	0
Restructuring charges																	11,560	0	0
Litigation settlement loss, net of $4,000 insurance recovery (Note 20)																	0	0	28,000
Income (loss) from operations																	42,495	49,706	65,103
Total other income (expense), net																	(41,096)	(14,331)	(20,782)
Income before income taxes and non-controlling interests	(12,829)	[1],[2],[3],[4],[5],[6],[7]	$ 16,129		$ 3,071		$ (4,972)		3,112	[7],[8]	$ 10,357		$ 12,160		$ 9,746		1,399	35,375	44,321
Total Assets:
Total assets	741,700								865,164								$ 741,700	865,164
Number of reportable segments | segment																	2
Insurance recovery proceeds	0								0								$ 0	0	4,000	$ 4,000
Operating Segment | Mortgage Market
SEGMENT REPORTING
Revenue																	686,905	793,684	827,324
Cost of revenue																	447,108	545,507	546,540
Gross profit																	239,797	248,177	280,784
Selling, general and administrative expenses																	85,013	114,215	121,508
Gain on sale of business																	0
Restructuring charges																	2,495
Litigation settlement loss, net of $4,000 insurance recovery (Note 20)																			0
Income (loss) from operations																	152,289	133,962	159,276
Total other income (expense), net																	81	72	154
Income before income taxes and non-controlling interests																	152,370	134,034	159,430
Total Assets:
Total assets	236,138								304,346								236,138	304,346
Operating Segment | Real Estate Market
SEGMENT REPORTING
Revenue																	90,290	89,787	86,590
Cost of revenue																	102,893	96,967	64,566
Gross profit																	(12,603)	(7,180)	22,024
Selling, general and administrative expenses																	21,561	18,718	23,291
Gain on sale of business																	(13,688)
Restructuring charges																	113
Litigation settlement loss, net of $4,000 insurance recovery (Note 20)																			0
Income (loss) from operations																	(20,589)	(25,898)	(1,267)
Total other income (expense), net																	77	(4)	(5)
Income before income taxes and non-controlling interests																	(20,512)	(25,902)	(1,272)
Total Assets:
Total assets	66,772								64,624								66,772	64,624
Other Businesses, Corporate and Eliminations
SEGMENT REPORTING
Revenue																	61,007	58,742	83,389
Cost of revenue																	72,164	57,391	78,939
Gross profit																	(11,157)	1,351	4,450
Selling, general and administrative expenses																	69,096	59,709	69,356
Gain on sale of business																	0
Restructuring charges																	8,952
Litigation settlement loss, net of $4,000 insurance recovery (Note 20)																			28,000
Income (loss) from operations																	(89,205)	(58,358)	(92,906)
Total other income (expense), net																	(41,254)	(14,399)	(20,931)
Income before income taxes and non-controlling interests																	(130,459)	(72,757)	(113,837)
Total Assets:
Total assets	$ 438,790								$ 496,194								$ 438,790	$ 496,194
Insurance recovery proceeds																			$ 4,000

[1] Effective January 1, 2018, the Company adopted Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which requires certain equity investments to be measured at fair value with changes in fair value recognized in net income. Previously, changes in the fair value of the Company’s available for sale securities were included in comprehensive income. During the three months ended March 31, 2018, June 30, 2018, September 30, 2018 and December 31, 2018, we recognized unrealized (losses) gains from our investment in RESI common shares of $(7.5) million, $1.5 million, $1.8 million and $(8.8) million, respectively. See Note 6.

[2] In April 2018, Altisource entered into the Credit Agreement, pursuant to which, among other things, Altisource borrowed $412.0 million in the form of Term B Loans. Proceeds from the Term B Loans were used to repay the Company’s prior senior secured term loan. In connection with the refinancing, we recognized a loss of $4.4 million from the write-off of the unamortized debt issuance costs and debt discount in the second quarter of 2018. See Note 14.

[3] In August 2018, we initiated Project Catalyst, a restructuring plan intended to optimize our operations and reduce costs to align our cost structure with our anticipated revenues and improve our operating margins. During the three months ended September 30, 2018 and December 31, 2018, we incurred $3.4 million and $8.1 million, respectively, of severance costs, facility shut-down costs and professional services fees related to the restructuring plan. See Note 24.

[4] In August 2018, we sold our rental property management business to RESI for total transaction proceeds of $18.0 million, $15.0 million of which was received on the closing date of August 8, 2018 and $3.0 million of which will be received on the earlier of a RESI change of control or August 8, 2023. We recognized a $13.7 million pretax gain on the sale of this business during the third quarter of 2018. See Note 4.

[5] In November 2018, the Company announced its plans to sell its BRS Inventory and discontinue the Company’s BRS business. The Company recorded a write-off of goodwill related to its plan to discontinue the BRS business of $2.6 million during the three months ended December 31, 2018. See Notes 9 and 11.

[6] In connection with a United States Supreme Court decision in June 2018, the Company is analyzing its services for potential exposure to sales tax in various jurisdictions in the United States and believes that the Company has a related estimated probable loss of $6.2 million. The Company recognized $5.9 million and $0.4 million during the three months ended September 30, 2018 and December 31, 2018, respectively. See Note 25.

[7] The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted average shares outstanding for each period.

[8] During the three months ended December, 31, 2017, the Company recognized net tax benefits of $284.1 million. On December 27, 2017, two of the Company’s wholly-owned subsidiaries, Altisource Solutions S.à r.l. and Altisource Holdings S.à r.l., merged, with Altisource Holdings S.à r.l. as the surviving entity. For Luxembourg tax purposes, the merger was recognized at fair value and generated an NOL of $1.3 billion and a deferred tax asset, net of valuation allowance, of $300.9 million. This deferred tax benefit was partially offset by $6.3 million of income tax from changes in U.S. and Luxembourg income tax rates and a $10.5 million increase in certain foreign income tax reserves (and related interest). See Note 22.