CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)	Total Sequential Brands Group, Inc. and Subsidiaries Stockholders' Equity	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2017	$ 281,991,000	$ 635,000	$ 508,444,000	$ 80,000	$ (225,369,000)		$ 71,547,000	$ 353,538,000
Balance (in shares) at Dec. 31, 2017		63,652,721
Treasury stock at Dec. 31, 2017						$ (1,799,000)
Treasury stock, shares at Dec. 31, 2017						(424,994)
Stock-based compensation	1,345,000	$ 2,000	1,343,000					1,345,000
Stock-based compensation (in shares)		452,929
Shares issued under stock incentive plan	1,500,000	$ 8,000	1,492,000					1,500,000
Shares issued under stock incentive plan (in shares)		843,486
Unrealized gain (loss) on interest rate caps, net of tax	679,000			679,000				679,000
Repurchase of common stock	(1,919,000)					$ (1,919,000)		(1,919,000)
Repurchase of common stock (in shares)						(986,858)
Noncontrolling interest distribution							(1,244,000)	(1,244,000)
Net income attributable to noncontrolling interest							1,960,000	1,960,000
Net loss attributable to common stockholders	(2,264,000)				(2,264,000)			(2,264,000)
Treasury stock at Mar. 31, 2018						$ (3,718,000)
Treasury stock, shares at Mar. 31, 2018						(1,411,852)
Balance at Mar. 31, 2018	282,462,000	$ 645,000	511,279,000	759,000	(226,503,000)		72,618,000	355,080,000
Balance (in shares) at Mar. 31, 2018		64,949,136
Cumulative effect of revenue recognition accounting change	1,130,000				1,130,000		355,000	1,485,000
Balance at Dec. 31, 2018	273,918,000	$ 657,000	513,764,000	(1,554,000)	(234,723,000)		70,726,000	344,644,000
Balance (in shares) at Dec. 31, 2018		65,990,179
Treasury stock at Dec. 31, 2018						$ (4,226,000)		$ (4,226,000)
Treasury stock, shares at Dec. 31, 2018						(1,662,597)		(1,662,597)
Stock-based compensation	726,000	$ 5,000	721,000					$ 726,000
Stock-based compensation (in shares)		457,734
Unrealized gain (loss) on interest rate caps, net of tax	(1,480,000)			(1,480,000)				(1,480,000)
Repurchase of common stock	(170,000)					$ (170,000)		(170,000)
Repurchase of common stock (in shares)						(134,839)
Noncontrolling interest distribution							(1,093,000)	(1,093,000)
Net income attributable to noncontrolling interest							1,539,000	1,539,000
Net loss attributable to common stockholders	(125,345,000)				(125,345,000)			(125,345,000)
Treasury stock at Mar. 31, 2019						$ (1,797,436)		$ (4,396,000)
Treasury stock, shares at Mar. 31, 2019						(4,396,000)		(1,797,436)
Balance at Mar. 31, 2019	$ 147,649,000	$ 662,000	$ 514,485,000	$ (3,034,000)	$ (360,068,000)		$ 71,172,000	$ 218,821,000
Balance (in shares) at Mar. 31, 2019		66,447,913