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Summary of Significant Accounting Policies - Revenue Recognition/Advertising Costs/Equity Method Investments (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Mar. 02, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Contract liability $ 24,300,000 $ 64,900,000 $ 24,300,000 $ 64,900,000 $ 26,700,000  
Revenue recognized 3,100,000 9,900,000 10,800,000 21,200,000    
Shipping and handling costs 13,800,000 21,200,000 63,300,000 61,200,000    
Income (loss) from equity method investments (921,000) (1,199,000) 969,000 (6,906,000)    
Net revenues $ 1,545,532,000 1,433,021,000 $ 4,154,261,000 3,070,901,000    
Dome Corporation            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Ownership percentage 29.50%   29.50%      
Income (loss) from equity method investments $ 0 0 $ 1,800,000 (1,400,000)    
Investment 1,800,000 0 1,800,000 0 0  
Dome Corporation | Licensing Receivable            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accounts receivable, net 8,900,000 8,500,000 8,900,000 8,500,000 22,900,000  
Dome Corporation | License            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net revenues 11,100,000 10,900,000 22,900,000 17,400,000    
UA Sports (Thailand) Co., Ltd            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Ownership percentage           49.50%
Income (loss) from equity method investments (921,000) 1,200,000 (873,000) 1,800,000    
Investment $ 4,700,000 $ 3,700,000 4,700,000 3,700,000 4,500,000  
Customer Refund Liability            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reserves for customer returns allowances markdowns and discounts     174,274,000 197,496,000 203,399,000  
Inventory Associated with the Reserves            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reserves for customer returns allowances markdowns and discounts     $ 50,544,000 $ 50,779,000 $ 57,867,000