Stock-based Compensation Plans - Options Outstanding and Option Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding	38,583
Weighted-average remaining contractual life (in years)	6 years 2 months 12 days
Weighted- average exercise price	$ 76.10
Options Exercisable	18,542
Weighted-average exercise price	$ 69.77
Exercise prices range $32.45 - $67.87
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$ 32.45
Exercise prices maximum range	$ 67.87
Options Outstanding	6,553
Weighted-average remaining contractual life (in years)	3 years 2 months 12 days
Weighted- average exercise price	$ 51.50
Options Exercisable	6,295
Weighted-average exercise price	$ 51.03
Exercise prices range $68.51 - $70.93
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$ 68.51
Exercise prices maximum range	$ 70.93
Options Outstanding	8,346
Weighted-average remaining contractual life (in years)	6 years 10 months 24 days
Weighted- average exercise price	$ 69.82
Options Exercisable	3,648
Weighted-average exercise price	$ 69.02
Exercise prices range $72.11 - $78.31
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$ 72.11
Exercise prices maximum range	$ 78.31
Options Outstanding	7,553
Weighted-average remaining contractual life (in years)	7 years 2 months 12 days
Weighted- average exercise price	$ 72.56
Options Exercisable	1,915
Weighted-average exercise price	$ 72.47
Exercise prices range $83.88 - $84.93
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$ 83.88
Exercise prices maximum range	$ 84.93
Options Outstanding	8,045
Weighted-average remaining contractual life (in years)	5 years 2 months 12 days
Weighted- average exercise price	$ 84.17
Options Exercisable	5,118
Weighted-average exercise price	$ 84.34
Exercise prices range $88.61 - $114.83
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$ 88.61
Exercise prices maximum range	$ 115
Options Outstanding	8,086
Weighted-average remaining contractual life (in years)	8 years 1 month 6 days
Weighted- average exercise price	$ 97.78
Options Exercisable	1,566
Weighted-average exercise price	$ 95.92

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

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)(iii)

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

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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

-Paragraph 2

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

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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

-Paragraph 2

-Subparagraph (c)(iii)

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

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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

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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

-Publisher FASB

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- Definition

Weighted average remaining contractual term of outstanding 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

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-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

-Name Accounting Standards Codification

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