The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii)

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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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

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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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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

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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

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-SubTopic 10

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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

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-Name Accounting Standards Codification

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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

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-Name Accounting Standards Codification

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Capital Stock - Details Regarding Outstanding and Exercisable Stock Options (Detail) (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 Options	2,710
Outstanding Options, Weighted-Average Remaining Life (Years)	3 years 8 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 36.61	$ 36.33	$ 34.40	$ 32.47
Number of Exercisable Options	2,508
Exercisable Options, Weighted-Average Remaining Life (Years)	3 years 3 months 18 days
Exercisable Options, Weighted-Average Exercise Price	$ 37.03	$ 37.03	$ 35.54
$10.00 - $19.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 10.00
Range of Exercise Prices, upper limit	$ 19.99
Number of Outstanding Options	193
Outstanding Options, Weighted-Average Remaining Life (Years)	4 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 11.84
Number of Exercisable Options	193
Exercisable Options, Weighted-Average Remaining Life (Years)	4 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 11.84
$20.00 - $24.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 20.00
Range of Exercise Prices, upper limit	$ 24.99
Number of Outstanding Options	295
Outstanding Options, Weighted-Average Remaining Life (Years)	5 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 24.42
Number of Exercisable Options	295
Exercisable Options, Weighted-Average Remaining Life (Years)	5 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 24.42
$25.00 - $29.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 25.00
Range of Exercise Prices, upper limit	$ 29.99
Number of Outstanding Options	367
Outstanding Options, Weighted-Average Remaining Life (Years)	7 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 27.69
Number of Exercisable Options	228
Exercisable Options, Weighted-Average Remaining Life (Years)	7 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 27.69
$30.00 - $34.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 30.00
Range of Exercise Prices, upper limit	$ 34.99
Number of Outstanding Options	117
Outstanding Options, Weighted-Average Remaining Life (Years)	7 years 3 months 18 days
Outstanding Options, Weighted-Average Exercise Price	$ 34.44
Number of Exercisable Options	69
Exercisable Options, Weighted-Average Remaining Life (Years)	6 years 8 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 34.70
$35.00 - $39.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 35.00
Range of Exercise Prices, upper limit	$ 39.99
Number of Outstanding Options	391
Outstanding Options, Weighted-Average Remaining Life (Years)	1 year 3 months 18 days
Outstanding Options, Weighted-Average Exercise Price	$ 39.01
Number of Exercisable Options	391
Exercisable Options, Weighted-Average Remaining Life (Years)	1 year 3 months 18 days
Exercisable Options, Weighted-Average Exercise Price	$ 39.01
$40.00 - $44.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 40.00
Range of Exercise Prices, upper limit	$ 44.99
Number of Outstanding Options	764
Outstanding Options, Weighted-Average Remaining Life (Years)	3 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 40.41
Number of Exercisable Options	764
Exercisable Options, Weighted-Average Remaining Life (Years)	3 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 40.41
$45.00 - $49.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 45.00
Range of Exercise Prices, upper limit	$ 49.99
Number of Outstanding Options	139
Outstanding Options, Weighted-Average Remaining Life (Years)	2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 46.80
Number of Exercisable Options	139
Exercisable Options, Weighted-Average Remaining Life (Years)	2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 46.80
$50.00 - $54.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 50.00
Range of Exercise Prices, upper limit	$ 54.99
Number of Outstanding Options	429
Outstanding Options, Weighted-Average Remaining Life (Years)	2 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 51.40
Number of Exercisable Options	429
Exercisable Options, Weighted-Average Remaining Life (Years)	2 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 51.40
$55.00 - $59.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 55.00
Range of Exercise Prices, upper limit	$ 59.99
Number of Outstanding Options	15
Outstanding Options, Weighted-Average Remaining Life (Years)	9 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 56.76
Exercisable Options, Weighted-Average Remaining Life (Years)	0 years