ORGANIZATION AND BASIS OF PRESENTATION - Impact of Topic 606 on Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 50,839			$ 52,740
Total current assets	251,296			271,641
Total assets	831,773			865,164
Other current liabilities	6,651			9,414
Deferred revenue	15,489			9,802
Total current liabilities	94,560			109,561
Deferred revenue, non-current	5,529			2,101
Retained earnings	600,253			626,600
Altisource equity	318,856			338,612
Total equity	320,082	$ 72,365		339,985	$ 62,194
Total liabilities and equity	831,773			$ 865,164
Revenue	197,438	240,483
Cost of revenue	147,194	177,953
Gross profit	50,244	62,530
Income from operations	7,120	14,829
Loss before income taxes and non-controlling interests	(4,972)	9,746
Income tax benefit	1,365	(2,586)
Net loss	(3,607)	7,160
Net loss attributable to Altisource	(4,132)	$ 6,545
Balances without adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	50,811
Total current assets	251,268
Total assets	831,745
Other current liabilities	6,999
Deferred revenue	8,834
Total current liabilities	88,253
Deferred revenue, non-current	1,639
Retained earnings	610,422
Altisource equity	329,025
Total equity	330,251
Total liabilities and equity	831,745
Revenue	197,850
Cost of revenue	147,991
Gross profit	49,859
Income from operations	6,735
Loss before income taxes and non-controlling interests	(5,357)
Income tax benefit	1,471
Net loss	(3,886)
Net loss attributable to Altisource	(4,411)
Accounting Standards Update 2014-09 | Adjustments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	(28)
Total current assets	(28)
Total assets	(28)
Other current liabilities	348
Deferred revenue	(6,655)		$ 11,200
Total current liabilities	(6,307)
Deferred revenue, non-current	(3,890)
Retained earnings	10,169		$ (10,400)
Altisource equity	10,169
Total equity	10,169
Total liabilities and equity	(28)
Revenue	412
Cost of revenue	797
Gross profit	(385)
Income from operations	(385)
Loss before income taxes and non-controlling interests	(385)
Income tax benefit	106
Net loss	(279)
Net loss attributable to Altisource	$ (279)