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Subsequent Event - Additional Information (Detail) - Subsequent Event	Oct. 23, 2018 $ / shares
Common Stock
Subsequent Event [Line Items]
Cash dividend, previous amount	$ 1.45
Cash dividend	$ 1.60
Date new dividend rate will be effective	2019-01
Class B Common Stock
Subsequent Event [Line Items]
Cash dividend, previous amount	$ 1.45
Cash dividend	$ 1.60
Date new dividend rate will be effective	2019-01

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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 Date Effective Month And Year

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- Definition

Board approved quarterly cash dividend rate applicable to January twenty nineteen.

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- Definition

Board approved quarterly cash dividend rate previous per share amount.

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