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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 01, 2019	Feb. 11, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Treasury stock, shares repurchased value			$ 110,977
Class A
Subsequent Event [Line Items]
Treasury stock, shares repurchased			0
Treasury stock, shares repurchased value			$ 0
Class A | 2005 Share Repurchase Program
Subsequent Event [Line Items]
Treasury stock, shares repurchased			880,667	0	0
Shares repurchased, average price per share			$ 126.02
Treasury stock, shares repurchased value			$ 111,000
Subsequent Event
Subsequent Event [Line Items]
Defined contribution plan name	401(k)
Subsequent Event | Class A | 2005 Share Repurchase Program
Subsequent Event [Line Items]
Treasury stock, shares repurchased		314,774
Shares repurchased, average price per share		$ 132.01
Treasury stock, shares repurchased value		$ 41,600

X

- Definition

Name of defined contribution plan designed to provide retirement benefits. Includes, but is not limited to, legal name of plan.

+ References

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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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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-Publisher FASB
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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

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