Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Preferred stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss	Treasury stock	Parent	Noncontrolling interest	Series A Preferred Stock Preferred stock	Series B Preferred Stock Preferred stock
Beginning balance (in shares) at Dec. 31, 2017		30,632					3,135
Increase (Decrease) in Stockholders' Equity
Common stock issued upon vesting of restricted stock (in shares)		166
Exercise of stock warrants (in shares)		1,250
Purchase of treasury stock (in shares)							47
Ending balance (in shares) at Mar. 31, 2018	28,866	32,048					3,182			127	555
Beginning balance at Dec. 31, 2017	$ 172,123			$ 494,732	$ (254,692)	$ (599)	$ (63,816)		$ (3,505)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Cumulative effect of change in accounting principle					5,040
Stock-based compensation to employees and directors				2,395					4,040
Tax withholding upon vesting of restricted stock									(1,680)
Exercise of stock warrants				50,562
Proceeds from security token offering									75,951
Net loss attributable to stockholders of Overstock.com, Inc.	(50,909)				(50,909)
Net other comprehensive income	4					4
Tax withholding upon vesting of restricted stock							(2,354)
Net loss attributable to noncontrolling interests	(3,547)								(3,547)
Paid-in capital attributable to noncontrolling interests									4,468
Other				(505)					505
Ending balance at Mar. 31, 2018	$ 256,093	$ 3	$ 0	$ 547,184	$ (300,561)	$ (595)	$ (66,170)	$ 179,861	$ 76,232