EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
EARNINGS PER SHARE
Net income attributable to Altisource (in dollars)	$ 30,293	$ 27,024	$ 28,081	$ 25,229	$ 25,731	$ 17,171	$ 13,385	$ 14,825	$ 110,627	$ 71,112	$ 49,271
Weighted-average common shares outstanding, basic	23,389,000	23,338,000	23,316,000	23,381,000	23,692,000	24,341,000	24,625,000	24,845,000	23,358,000	24,373,000	25,083,000
Dilutive effect of stock options (in shares)									1,604,000	1,312,000	1,176,000
Weighted-average common shares outstanding, diluted	25,162,000	25,016,000	24,846,000	24,844,000	25,142,000	25,489,000	25,773,000	25,928,000	24,962,000	25,685,000	26,259,000
Earnings per share
Basic (in dollars per share)	$ 1.30	$ 1.16	$ 1.20	$ 1.08	$ 1.09	$ 0.71	$ 0.54	$ 0.60	$ 4.74	$ 2.92	$ 1.96
Diluted (in dollars per share)	$ 1.20	$ 1.08	$ 1.13	$ 1.02	$ 1.02	$ 0.67	$ 0.52	$ 0.57	$ 4.43	$ 2.77	$ 1.88
Options
Anti-dilutive securities
Options excluded from the computation of diluted EPS (in shares)										100,000	100,000
Options for shares issuable upon achievement of market and performance criteria
Anti-dilutive securities
Options excluded from the computation of diluted EPS (in shares)									300,000	300,000	700,000