Gains on Sale of Trademarks, net - Schedule of Gains on Sale of Trademarks, Net (Parenthetical) (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Sep. 30, 2020	Jul. 31, 2020	Dec. 31, 2020
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Proceeds from loan to equity investee			$ 2,750
Umbro China Limited
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Proceeds from loan to equity investee		$ 62,500
Starter China Limited
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Proceeds from loan to equity investee	$ 16,000		$ 16,000