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Goodwill and Identifiable Intangible Assets - Significant Assumptions Used to Estimate the Fair Values of Tradenames Impaired (Parenthetical) (Detail) - Long-term Revenue Growth Rate [Member]	12 Months Ended
	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Long-term revenue growth rate projection period	10 years
Alternative Investment, Type [Extensible List]	Tradename [Member]

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- Definition

Long-term revenue growth rate projection period.

+ References

No definition available.

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- Definition

Indicates type of alternative investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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