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Goodwill and Trademarks and Other Intangibles, net - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Intangible Assets By Major Class [Line Items]            
Changes in goodwill       $ 0    
Impairment of goodwill       0 $ 37,812,000  
Goodwill   $ 26,099,000   26,099,000   $ 26,099,000
Impairment of the indefinite-lived trademarks     $ 4,386,000   77,721,000  
Amortization of trademarks and other intangibles       52,000 205,000  
Trademarks            
Intangible Assets By Major Class [Line Items]            
Impairment of the definite-lived trademarks   0   0    
Ecko Trademark            
Intangible Assets By Major Class [Line Items]            
Increase in trademark value $ 3,400,000          
Joe Boxer Trademark            
Intangible Assets By Major Class [Line Items]            
Impairment of the indefinite-lived trademarks     $ 4,400,000   4,400,000  
Trademarks            
Intangible Assets By Major Class [Line Items]            
Impairment of the indefinite-lived trademarks   0   0    
Residual value   0   0    
Trademarks | Women's            
Intangible Assets By Major Class [Line Items]            
Impairment of the indefinite-lived trademarks         $ 73,300,000  
Iconix Australia            
Intangible Assets By Major Class [Line Items]            
Ownership interest acquired     5.00%   5.00%  
Maximum            
Intangible Assets By Major Class [Line Items]            
Amortization of trademarks and other intangibles   $ 100,000 $ 100,000 $ 100,000    
Maximum | Trademarks            
Intangible Assets By Major Class [Line Items]            
Finite-lived intangible assets, useful life       15 years    
Maximum | Non-compete agreements and contracts            
Intangible Assets By Major Class [Line Items]            
Finite-lived intangible assets, useful life       9 years    
Maximum | Trademarks            
Intangible Assets By Major Class [Line Items]            
Finite-lived intangible assets, useful life       15 years    
Maximum | Iconix Australia            
Intangible Assets By Major Class [Line Items]            
Goodwill     $ 100,000   $ 100,000  
Minimum | Trademarks            
Intangible Assets By Major Class [Line Items]            
Finite-lived intangible assets, useful life       10 years    
Minimum | Non-compete agreements and contracts            
Intangible Assets By Major Class [Line Items]            
Finite-lived intangible assets, useful life       1 year    
Minimum | Trademarks            
Intangible Assets By Major Class [Line Items]            
Finite-lived intangible assets, useful life       10 years