Goodwill and Identifiable Intangible Assets - Significant Assumptions Used to Estimate the Fair Values of Tradenames Impaired (Detail) - Tradename [Member]		Dec. 31, 2020		Dec. 31, 2019
Minimum [Member] | Discount Rates [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
Minimum [Member] | Royalty Rates [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
Minimum [Member] | Long-term Revenue Growth Rates [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
Maximum [Member] | Discount Rates [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
Maximum [Member] | Royalty Rates [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
Maximum [Member] | Long-term Revenue Growth Rates [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
Weighted Average [Member] | Discount Rates [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
Weighted Average [Member] | Royalty Rates [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used to estimate the fair values	[3]	0.043	[1]	0.033
Weighted Average [Member] | Long-term Revenue Growth Rates [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

[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.