Acquisitions (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Jul. 01, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Acquisitions Additional Information [Line Items]
Net revenue		$ 48,874	$ 40,771	$ 42,207	$ 38,104	$ 46,895	$ 39,025	$ 42,144	$ 39,400	$ 169,956	$ 167,464	$ 155,528
Common stock, par or stated value per share		$ 0.01				$ 0.01				$ 0.01	$ 0.01
Gaiam Brand Holdco, LLC [Member]
Disclosure Acquisitions Additional Information [Line Items]
Business acquisition, cost of acquired entity, cash paid	$ 145,700
Business acquisition, percentage of voting interests acquired	49.90%
Legal and other fees related to acquisition												3,800
Net revenue												12,000
Income from continuing operations												$ 11,100
Gaiam Brand Holdco, LLC [Member] | Employee Severance [Member]
Disclosure Acquisitions Additional Information [Line Items]
Business combination, acquisition-related costs	$ 1,900