Related Party Transactions - Summary of Royalty Revenue Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Royalty revenue	$ 23,634	$ 27,951
Royalty
Related Party Transaction [Line Items]
Royalty revenue	1,262	971
M.G.S. Sports Trading Limited | Royalty
Related Party Transaction [Line Items]
Royalty revenue	69	107
Pac Brands USA, Inc. | Royalty
Related Party Transaction [Line Items]
Royalty revenue	74	80
Albion Equity Partners LLC / GL Damek | Royalty
Related Party Transaction [Line Items]
Royalty revenue	721	587
Li Ning | Royalty
Related Party Transaction [Line Items]
Royalty revenue	201
Sports Direct International plc | Royalty
Related Party Transaction [Line Items]
Royalty revenue	$ 197	$ 197