Net Income per Share - Computation of Earnings Per Share, Basic (Parenthetical) (Detail) - shares	May 06, 2020	Mar. 11, 2020	Dec. 13, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Conversion of Class B Common Stock into Class A Common Stock	215,000	150,000	145,000

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration