Related Party Transactions - Summary of Royalty Revenue Recognized (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Royalty revenue		$ 108,576	$ 148,984
Royalty
Related Party Transaction [Line Items]
Royalty revenue		5,587	4,348
Royalty | M.G.S. Sports Trading Limited
Related Party Transaction [Line Items]
Royalty revenue		400	440
Royalty | Pac Brands USA, Inc.
Related Party Transaction [Line Items]
Royalty revenue		329	363
Royalty | Albion Equity Partners LLC / GL Damek
Related Party Transaction [Line Items]
Royalty revenue		2,412	2,350
Royalty | Li Ning
Related Party Transaction [Line Items]
Royalty revenue		617
Royalty | MHMC
Related Party Transaction [Line Items]
Royalty revenue	[1]		7
Royalty | Sports Direct International plc
Related Party Transaction [Line Items]
Royalty revenue		$ 1,829	$ 1,188

[1] As detailed in Note 4, as of July 2019, MHMC is no longer a related party.