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Organization, Nature of Operations, and Principles of Consolidation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | May 04, 2016
Restructuring Cost And Reserve [Line Items] |  |  |
Percentage of digital streaming exclusively available for subscribers | 90.00% |  |
Entity Incorporation, Date of Incorporation | Jul. 07, 1988 |  |
Maximum number of common stock and vested stock options for tender offer |  | 12,000,000 |
Stock Option [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Repurchase of common stock, per share amount |  | $ 7.75 |
Repurchase of common stock, shares |  | 842,114 |
Payments for repurchase of equity |  | $ 1.4 |
Class A Common Stock [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Repurchase of common stock, per share amount |  | $ 7.75 |
Repurchase of common stock, shares |  | 9,636,848 |
Payments for repurchase of equity |  | $ 74.7 |
Gaiam Brand Segment [Member] | Natural Habitat, Inc. [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Percentage of noncontrolling interest in subsidiaries |  | 51.40% | 51.40%

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