ORGANIZATION AND BASIS OF PRESENTATION - Impact of Topic 606 on Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 45,426		$ 45,426			$ 52,740
Total current assets	243,189		243,189			271,641
Total assets	809,896		809,896			865,164
Other current liabilities	5,889		5,889			9,414
Deferred revenue	19,131		19,131			9,802
Total current liabilities	133,866		133,866			109,561
Deferred revenue, non-current	41		41			2,101
Retained earnings	596,268		596,268			626,600
Altisource equity	310,887		310,887			338,612
Total equity	312,291	$ 66,723	312,291	$ 66,723		339,985	$ 62,194
Total liabilities and equity	809,896		809,896			$ 865,164
Revenue	218,556	250,685	415,994	491,168
Cost of revenue	163,206	185,393	310,400	363,346
Gross profit	55,350	65,292	105,594	127,822
Income from operations	12,426	12,822	19,546	27,651
Income (loss) before income taxes and non-controlling interests	3,071	12,160	(1,901)	21,906
Income tax (provision) benefit	(816)	(2,438)	549	(5,024)
Net income (loss)	2,255	9,722	(1,352)	16,882
Net income (loss) attributable to Altisource	1,568	$ 9,035	(2,564)	$ 15,580
Balances without adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	46,068		46,068
Total current assets	243,831		243,831
Total assets	810,538		810,538
Other current liabilities	5,672		5,672
Deferred revenue	10,031		10,031
Total current liabilities	124,549		124,549
Deferred revenue, non-current	1,201		1,201
Retained earnings	605,067		605,067
Altisource equity	319,686		319,686
Total equity	321,090		321,090
Total liabilities and equity	810,538		810,538
Revenue	217,353		415,203
Cost of revenue	163,868		311,859
Gross profit	53,485		103,344
Income from operations	10,561		17,296
Income (loss) before income taxes and non-controlling interests	1,206		(4,151)
Income tax (provision) benefit	(272)		1,199
Net income (loss)	934		(2,952)
Net income (loss) attributable to Altisource	247		(4,164)
Accounting Standards Update 2014-09 | Adjustments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	642		642
Total current assets	642		642
Total assets	642		642
Other current liabilities	(217)		(217)		$ 300
Deferred revenue	(9,100)		(9,100)		11,200
Total current liabilities	(9,317)		(9,317)
Deferred revenue, non-current	1,160		1,160
Retained earnings	8,799		8,799		$ (10,400)
Altisource equity	8,799		8,799
Total equity	8,799		8,799
Total liabilities and equity	642		642
Revenue	(1,203)		(791)
Cost of revenue	662		1,459
Gross profit	(1,865)		(2,250)
Income from operations	(1,865)		(2,250)
Income (loss) before income taxes and non-controlling interests	(1,865)		(2,250)
Income tax (provision) benefit	544		650
Net income (loss)	(1,321)		(1,600)
Net income (loss) attributable to Altisource	$ (1,321)		$ (1,600)