Stock-Based Compensation Plans - Additional Information 3 (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 70,681,000	$ 64,369,000	$ 52,770,000
Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	356,194	402,053	364,082
Stock-based compensation expense	26,300,000	19,700,000	11,800,000
Unrecognized compensation related to Awards	26,900,000
Weighted average period	1 year 9 months 18 days
Vesting period	3 years	3 years	3 years
Granted, weighted average grant date fair value	$ 84.87	$ 71.26	$ 63.44
Restricted Stock Liability Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	272,052	424,809	380,808
Stock-based compensation expense	25,200,000	27,400,000	21,500,000
Unrecognized compensation related to Awards	22,000,000
Weighted average period	1 year 9 months 18 days
Vesting period	3 years	3 years	3 years
Granted, weighted average grant date fair value	$ 87.34	$ 75.53	$ 64.06
Proceeds received from sale of stock held in deferred compensation plan	$ 16,000,000
Restricted Stock Liability Awards \| Non Employee Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	64,000	18,000	14,700
Restricted Stock Liability Awards \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	208,000	407,000	366,300

Proceeds received from sale of stock held in deferred compensation plan.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-Topic 718

-SubTopic 10

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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