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Subsequent Event - Additional Information (Detail) - Common and Class B Common Stock - $ / shares		6 Months Ended
	Jul. 18, 2016	Jun. 30, 2016
Subsequent Event [Line Items]
Cash dividend		$ 0.85
Subsequent Event
Subsequent Event [Line Items]
Cash dividend approved	$ 1.05

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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X

- 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.

+ References

No definition available.

+ Details

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X

- Definition

Board Approved Quarterly Cash Dividend Rate Applicable To October Twenty Sixteen

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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