Summary of Long Lived Asset Impairment Evaluations Performed by Assets Classification (Detail)	3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Goodwill
Impaired Long Lived Assets Held And Used [Line Items]
Long lived assets imapirement, Valuation Multiple			N/A
Goodwill | Market Approach
Impaired Long Lived Assets Held And Used [Line Items]
Long lived assets imapirement, Valuation Multiple	3.1 to 7 times	2.9 to 7 times		8 times
Tradename Intangible Assets
Impaired Long Lived Assets Held And Used [Line Items]
Long lived assets imapirement, Valuation Multiple			N/A
Tradename Intangible Assets | Income Approach
Impaired Long Lived Assets Held And Used [Line Items]
Long lived assets imapirement, Valuation Multiple	N/A	N/A		N/A
Other long-lived assets
Impaired Long Lived Assets Held And Used [Line Items]
Long lived assets imapirement, Valuation Multiple			N/A
Other long-lived assets | Market Approach
Impaired Long Lived Assets Held And Used [Line Items]
Long lived assets imapirement, Valuation Multiple	3.1 to 6 times	3.2 to 6 times		6 times