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