QUARTERLY DATA (UNAUDITED) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Data (Unaudited) [Abstract]
Net revenue	$ 24,245	$ 25,392	$ 26,415	$ 25,524	$ 35,246	$ 29,455	$ 33,126	$ 29,463		$ 101,576	$ 127,290	$ 124,780
Income (loss) from continuing operations	4,274	(19,964)	12,508	9,978	17,003	(3,858)	17,723	11,183		6,796	42,051	(269,600)
Loss from continuing operations before income taxes	(9,529)	(33,855)	(2,214)	(3,473)	2,519	(17,689)	3,742	(2,478)		(49,071)	(13,906)	(330,584)
Loss from continuing operations	(7,489)	(27,820)	(1,835)	(3,232)	(4,827)	(8,881)	3,301	(1,555)		(40,376)	(11,962)	(286,161)
Net income attributable to noncontrolling interest	(419)	9,449	(1,455)	(1,539)	(863)	(1,581)	(1,102)	(1,960)		6,036	(5,506)	(4,172)
Loss from continuing operations attributable to Sequential Brands Group, Inc. and Subsidiaries	(7,908)	(18,371)	(3,290)	(4,771)	(5,690)	(10,462)	2,199	(3,515)		(34,340)	(17,468)	(290,333)
(Loss) income from discontinued operations, net of income taxes	(2,871)	(309)	(1,309)	(120,574)	3,496	847	1,388	1,253		(125,063)	6,984	104,615
Net (loss) income attributable to Sequential Brands Group, Inc. and Subsidiaries	$ (10,779)	$ (18,680)	$ (4,599)	$ (125,345)	$ (2,194)	$ (9,615)	$ 3,587	$ (2,262)		$ (159,403)	$ (10,484)	$ (185,718)
(Loss) earnings per share - basic:
Continuing operations	$ (0.12)	$ (0.28)	$ (0.05)	$ (0.07)	$ (0.09)	$ (0.16)	$ 0.03	$ (0.06)
(Loss) earnings per share - basic					(0.05)	(0.01)	(0.03)	(0.02)		$ (1.93)	$ 0.11	$ 1.66
Continuing operations, diluted					(0.09)	(0.16)	0.02	(0.06)
(Loss) earnings per share - diluted					0.05	0.01	0.02	0.02		(1.93)	0.11	1.66
(Loss) earnings per share attributable to Sequential Brands Group, Inc. and Subsidiaries:
Basic					(0.03)	(0.15)	0.06	(0.04)
Diluted					$ (0.03)	$ (0.15)	$ 0.06	$ (0.04)
Continuing Operations, Loss per share - basic and diluted										(0.53)	(0.27)	(4.62)
Discontinued operations	(0.04)	0.00	(0.02)	(1.88)
Attributable to Sequential Brands Group, Inc. and Subsidiaries	$ (0.16)	$ (0.29)	$ (0.07)	$ (1.95)						$ (2.46)	$ (0.16)	$ (2.95)
Non-cash impairment charges of goodwill					$ 304,100				$ 304,100			$ 304,100