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Treasury Stock - Additional Information (Detail) - USD ($)		3 Months Ended
	Apr. 26, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Treasury stock, shares		6,405,000		6,405,000
Treasury stock, cost		$ 475,184,000		$ 475,184,000
Class A | 2005 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Shares repurchased program expiration date		Apr. 29, 2018
Stock authorized to repurchase by board of directors		$ 800,000,000
Treasury stock, shares		3,826,947
Treasury stock, shares repurchased		0	0
Shares repurchased, average price per share		$ 90.23
Treasury stock, cost		$ 345,300,000
Class A | 2005 Share Repurchase Program | Board of Directors | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Shares repurchased program expiration date	Apr. 29, 2023

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Amount of stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Topic 505
-SubTopic 30
-Section 45
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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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