Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

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Stock-Based Compensation Plans - Outstanding SARs (Detail) (Stock Appreciation Rights (SARs), USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of outstanding Number of exercisable, Shares	1,966,549
Weighted Average Remaining Contractual Life (in years)	1 year 10 months 13 days
Weighted Average Exercise Price, Outstanding	$ 59.80	$ 56.36	$ 52.52	$ 41.47
Number of exercisable, Shares	1,521,832
Weighted Average Exercise Price, Exercisable	$ 56.64
Range of Exercise Prices One
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 31.13
Exercise Price, Maximum	$ 39.99
Number of outstanding Number of exercisable, Shares	3,260
Weighted Average Remaining Contractual Life (in years)	6 months 29 days
Weighted Average Exercise Price, Outstanding	$ 38.82
Number of exercisable, Shares	3,260
Weighted Average Exercise Price, Exercisable	$ 38.82
Range of Exercise Prices Two
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 40.00
Exercise Price, Maximum	$ 49.99
Number of outstanding Number of exercisable, Shares	542,206
Weighted Average Remaining Contractual Life (in years)	5 months 27 days
Weighted Average Exercise Price, Outstanding	$ 46.47
Number of exercisable, Shares	542,206
Weighted Average Exercise Price, Exercisable	$ 46.47
Range of Exercise Prices Three
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 50.00
Exercise Price, Maximum	$ 59.99
Number of outstanding Number of exercisable, Shares	355,856
Weighted Average Remaining Contractual Life (in years)	1 year 4 months 17 days
Weighted Average Exercise Price, Outstanding	$ 52.35
Number of exercisable, Shares	355,856
Weighted Average Exercise Price, Exercisable	$ 52.35
Range of Exercise Prices Four
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 60.00
Exercise Price, Maximum	$ 69.99
Number of outstanding Number of exercisable, Shares	614,909
Weighted Average Remaining Contractual Life (in years)	2 years 3 months 29 days
Weighted Average Exercise Price, Outstanding	$ 64.18
Number of exercisable, Shares	422,546
Weighted Average Exercise Price, Exercisable	$ 64.21
Range of Exercise Prices Five
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 70.00
Exercise Price, Maximum	$ 79.99
Number of outstanding Number of exercisable, Shares	448,418
Weighted Average Remaining Contractual Life (in years)	3 years 3 months 18 days
Weighted Average Exercise Price, Outstanding	$ 75.88
Number of exercisable, Shares	196,064
Weighted Average Exercise Price, Exercisable	$ 76.30
Range of Exercise Prices Six
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price, Minimum	$ 80.00
Exercise Price, Maximum	$ 81.15
Number of outstanding Number of exercisable, Shares	1,900
Weighted Average Remaining Contractual Life (in years)	3 years 8 months 9 days
Weighted Average Exercise Price, Outstanding	$ 81.15
Number of exercisable, Shares	1,900
Weighted Average Exercise Price, Exercisable	$ 81.15