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

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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
-Topic 718
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
-Subparagraph (g)
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- Definition

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

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- Definition

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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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Capital Stock - Details Regarding Outstanding and Exercisable Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options	2,800
Outstanding Options, Weighted-Average Remaining Life (Years)	3 years 6 months
Outstanding Options, Weighted-Average Exercise Price	$ 36.84	$ 36.61	$ 36.33	$ 34.40
Number of Exercisable Options	2,500
Exercisable Options, Weighted-Average Remaining Life (Years)	2 years 9 months 18 days
Exercisable Options, Weighted-Average Exercise Price	$ 36.03	$ 37.03	$ 37.03
$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	188
Outstanding Options, Weighted-Average Remaining Life (Years)	3 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 11.84
Number of Exercisable Options	188
Exercisable Options, Weighted-Average Remaining Life (Years)	3 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	293
Outstanding Options, Weighted-Average Remaining Life (Years)	4 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 24.42
Number of Exercisable Options	293
Exercisable Options, Weighted-Average Remaining Life (Years)	4 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	365
Outstanding Options, Weighted-Average Remaining Life (Years)	6 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 27.69
Number of Exercisable Options	365
Exercisable Options, Weighted-Average Remaining Life (Years)	6 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)	6 years 3 months 18 days
Outstanding Options, Weighted-Average Exercise Price	$ 34.44
Number of Exercisable Options	93
Exercisable Options, Weighted-Average Remaining Life (Years)	6 years 1 month 6 days
Exercisable Options, Weighted-Average Exercise Price	$ 34.53
$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	364
Outstanding Options, Weighted-Average Remaining Life (Years)	4 months 24 days
Outstanding Options, Weighted-Average Exercise Price	$ 39.01
Number of Exercisable Options	364
Exercisable Options, Weighted-Average Remaining Life (Years)	4 months 24 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	1,029
Outstanding Options, Weighted-Average Remaining Life (Years)	4 years
Outstanding Options, Weighted-Average Exercise Price	$ 41.33
Number of Exercisable Options	764
Exercisable Options, Weighted-Average Remaining Life (Years)	2 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 40.41
$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)	1 year 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 51.40
Number of Exercisable Options	429
Exercisable Options, Weighted-Average Remaining Life (Years)	1 year 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)	8 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price	$ 56.76
Number of Exercisable Options	5
Exercisable Options, Weighted-Average Remaining Life (Years)	8 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price	$ 56.76