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Subsequent Event - Additional Information (Detail) - Common Stock [Member] - Class B Common Stock - $ / shares		12 Months Ended
	Feb. 11, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Cash dividend, previous rate		$ 1.60
Subsequent Event
Subsequent Event [Line Items]
Cash dividend, current rate	$ 1.775

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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- Definition

Board approved quarterly cash dividend rate applicable to april twenty twenty.

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- Definition

Board approved quarterly cash dividend rate previous per share amount.

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