QUARTERLY RESULTS OF OPERATIONS (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, net
Direct		$ 33,599	$ 33,621	$ 34,428	$ 36,135	$ 42,606	$ 33,592	$ 33,215	$ 38,047	$ 137,783	$ 147,460	$ 156,032
Partner and other		446,671	357,590	353,585	362,209	427,754	319,399	299,330	303,160	1,520,055	1,349,643	1,148,185
Total net revenue		480,270	391,211	388,013	398,344	470,360	352,991	332,545	341,207	1,657,838	1,497,103	1,304,217
Cost of goods sold
Direct	[1]	32,326	31,989	31,235	32,527	37,298	29,385	29,473	33,097	128,077	129,253	136,282
Partner and other		364,835	286,771	283,121	290,380	347,682	256,548	240,447	244,114	1,225,107	1,088,791	920,275
Total cost of goods sold		397,161	318,760	314,356	322,907	384,980	285,933	269,920	277,211	1,353,184	1,218,044	1,056,557
Gross profit		83,109	72,451	73,657	75,437	85,380	67,058	62,625	63,996	304,654	279,059	247,660
Operating expenses:
Sales and marketing	[1]	38,347	30,062	28,087	27,972	37,098	25,428	23,543	23,392	124,468	109,461	91,609
Technology	[1]	26,303	25,084	24,059	23,087	23,047	22,202	21,408	19,601	98,533	86,258	71,788
General and administrative	[1]	21,548	20,676	19,429	20,534	23,527	17,073	15,881	15,296	82,187	71,777	68,169
Restructuring						0	0	0	(360)	0	(360)	(471)
Total operating expenses		86,198	75,822	71,575	71,593	83,672	64,703	60,832	57,929	305,188	267,136	231,095
Operating (loss) income		(3,089)	(3,371)	2,082	3,844	1,708	2,355	1,793	6,067	(534)	11,923	16,565
Interest income		37	37	38	43	38	36	37	41	155	152	127
Interest expense		(66)	(62)	(8)	(4)	(9)	(11)	(12)	(7)	(140)	(39)	(113)
Other income (expense), net		1,102	764	1,163	605	536	(350)	524	459	3,634	1,169	(235)
Net income (loss) before income taxes		(2,016)	(2,632)	3,275	4,488	2,273	2,030	2,342	6,560	3,115	13,205	16,344
Provision (benefit) for income taxes		(1,879)	(15)	1,849	1,940	968	413	433	2,590	1,895	4,404	(68,034)
Consolidated net income		(137)	(2,617)	1,426	2,548	1,305	1,617	1,909	3,970	1,220	8,801	84,378
Less: Net loss attributable to noncontrolling interests		(247)	(546)	(242)	(191)	(53)	0	0	0	(1,226)	(53)	0
Net income attributable to stockholders of Overstock.com, Inc.		$ 110	$ (2,071)	$ 1,668	$ 2,739	$ 1,358	$ 1,617	$ 1,909	$ 3,970	$ 2,446	$ 8,854	$ 84,378
Net income per common share—basic:
Net income attributable to common shares-basic (in dollars per share)		$ 0.00	$ (0.08)	$ 0.07	$ 0.11	$ 0.06	$ 0.07	$ 0.08	$ 0.17	$ 0.10	$ 0.37	$ 3.56
Weighted average common shares outstanding-basic (in shares)		25,234	24,681	24,306	24,213	24,031	24,027	24,009	23,926	24,612	23,999	23,714
Net income per common share-diluted:
Net income attributable to common shares-diluted (in dollars per share)		$ 0.00	$ (0.08)	$ 0.07	$ 0.11	$ 0.06	$ 0.07	$ 0.08	$ 0.16	$ 0.10	$ 0.36	$ 3.47
Weighted average common shares outstanding-diluted (in shares)		25,266	24,681	24,398	24,390	24,399	24,283	24,247	24,339	24,703	24,317	24,294

[1] (1) Includes stock-based compensation as follows (Note 15): Cost of goods sold — direct $179 $181 $154 Sales and marketing 217 336 167 Technology 646 751 352 General and administrative 2,484 2,767 2,578 Total $3,526 $4,035 $3,251