Revenue Recognition - Summary of Revenues Disaggregated by License Type (Parenthetical) (Detail) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Total revenue		$ 46,224,000	$ 53,165,000	$ 144,984,000	$ 173,535,000
Other Licenses
Disaggregation Of Revenue [Line Items]
Total revenue	[1]	198,000	48,000	3,095,000	170,000
Other Licenses | Umbro Business
Disaggregation Of Revenue [Line Items]
Total revenue		$ 200,000		$ 2,800,000
Other Licenses | Maximum | Umbro Business
Disaggregation Of Revenue [Line Items]
Total revenue			$ 100,000		$ 100,000

[1] Included in Other licenses for the Current Quarter and the Current Year Nine Months is $0.2 million and $2.8 million, respectively, of revenue associated with the Umbro business purchases discussed above as compared to less than $0.1 million for both the Prior Year Quarter and Prior Year Nine Months.