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Goodwill and Identifiable Intangible Assets - Significant Assumptions Used to Estimate the Fair Values of Tradenames Impaired (Detail)
Sep. 30, 2020
Dec. 31, 2019
Long-term Revenue Growth Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Alternative Investment, Type [Extensible List] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Minimum [Member] | Discount Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values 0.148 0.130
Alternative Investment, Type [Extensible List] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Minimum [Member] | Royalty Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values [1] 0.040 0.030
Alternative Investment, Type [Extensible List] [1] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Minimum [Member] | Long-term Revenue Growth Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values [2] 0.010 0.030
Alternative Investment, Type [Extensible List] [2] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Maximum [Member] | Discount Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values 0.158 0.135
Alternative Investment, Type [Extensible List] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Maximum [Member] | Royalty Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values [1] 0.050 0.040
Alternative Investment, Type [Extensible List] [1] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Maximum [Member] | Long-term Revenue Growth Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values [2] 0.030 0.030
Alternative Investment, Type [Extensible List] [2] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Weighted Average [Member] | Discount Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values [3] 0.151 0.133
Alternative Investment, Type [Extensible List] [3] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Weighted Average [Member] | Royalty Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values [1],[3] 0.043 0.033
Alternative Investment, Type [Extensible List] [1],[3] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
Weighted Average [Member] | Long-term Revenue Growth Rate [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Assumptions used to estimate the fair values [2],[3] 0.016 0.030
Alternative Investment, Type [Extensible List] [2],[3] us-gaap:TradeNamesMember us-gaap:TradeNamesMember
[1] Represents estimated percentage of sales a market-participant would pay to license the impaired tradenames.
[2] Selected long-term revenue growth rate within 10-year projection period of the impaired tradenames.
[3] Weighted by relative fair value of the impaired tradenames.