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Subsequent Events - Additional Information (Detail)
$ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 25, 2018
Individual
Non-voting
shares
Jul. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Subsequent Event [Line Items]              
Licensing revenue     $ 50,212   $ 61,647 $ 98,761 $ 120,370
Sports Direct              
Subsequent Event [Line Items]              
Licensing revenue     $ 300 $ 500   $ 600 $ 800
Subsequent Event | Sports Direct              
Subsequent Event [Line Items]              
Number of common stock owned | shares 5.7            
Right to appoint number of non-voting observers | Non-voting 1            
Subsequent Event | Sports Direct | Director              
Subsequent Event [Line Items]              
Number of individuals to be nominated as directors | Individual 2            
Subsequent Event | Iconix Australia, LLC              
Subsequent Event [Line Items]              
Ownership interest acquired   5.00%          
Payments to acquire ownership interest   $ 700          
Company ownership interest   55.00%          
Percentage of ownership interest sold   45.00%