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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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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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=96867065&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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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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-SubTopic 10
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-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
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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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Capital Stock - Details Regarding Outstanding and Exercisable Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options (in shares)	3,600,000
Outstanding Options, Weighted-Average Remaining Life (Years)	5 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 22.96	$ 29.16	$ 36.84	$ 36.61
Number of Exercisable Options (in shares)	2,221,000
Exercisable Options, Weighted-Average Remaining Life (Years)	3 years 1 month 6 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 29.76	$ 35.89	$ 36.03
$5.00 – $9.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	5
Range of Exercise Prices, upper limit (USD per share)	$ 9.99
Number of Outstanding Options (in shares)	869,000
Outstanding Options, Weighted-Average Remaining Life (Years)	8 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 9.44
Number of Exercisable Options (in shares)	299,000
Exercisable Options, Weighted-Average Remaining Life (Years)	8 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 9.44
$10.00 – $19.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	10.00
Range of Exercise Prices, upper limit (USD per share)	$ 19.99
Number of Outstanding Options (in shares)	910,000
Outstanding Options, Weighted-Average Remaining Life (Years)	7 years 6 months
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 10.52
Number of Exercisable Options (in shares)	188,000
Exercisable Options, Weighted-Average Remaining Life (Years)	1 year 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 11.84
$20.00 – $24.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	20.00
Range of Exercise Prices, upper limit (USD per share)	$ 24.99
Number of Outstanding Options (in shares)	287,000
Outstanding Options, Weighted-Average Remaining Life (Years)	2 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 24.42
Number of Exercisable Options (in shares)	287,000
Exercisable Options, Weighted-Average Remaining Life (Years)	2 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 24.42
$25.00 – $29.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	25.00
Range of Exercise Prices, upper limit (USD per share)	$ 29.99
Number of Outstanding Options (in shares)	364,000
Outstanding Options, Weighted-Average Remaining Life (Years)	4 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 27.69
Number of Exercisable Options (in shares)	364,000
Exercisable Options, Weighted-Average Remaining Life (Years)	4 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 27.69
$30.00 – $34.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	30.00
Range of Exercise Prices, upper limit (USD per share)	$ 34.99
Number of Outstanding Options (in shares)	113,000
Outstanding Options, Weighted-Average Remaining Life (Years)	4 years 4 months 24 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 34.42
Number of Exercisable Options (in shares)	113,000
Exercisable Options, Weighted-Average Remaining Life (Years)	4 years 4 months 24 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 34.42
$35.00 – $39.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	35.00
Range of Exercise Prices, upper limit (USD per share)	$ 39.99
Number of Outstanding Options (in shares)	25,000
Outstanding Options, Weighted-Average Remaining Life (Years)	7 months 6 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 39.99
Number of Exercisable Options (in shares)	25,000
Exercisable Options, Weighted-Average Remaining Life (Years)	7 months 6 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 39.99
$40.00 – $49.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	40.00
Range of Exercise Prices, upper limit (USD per share)	$ 44.99
Number of Outstanding Options (in shares)	1,017,000
Outstanding Options, Weighted-Average Remaining Life (Years)	2 years
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 41.34
Number of Exercisable Options (in shares)	930,000
Exercisable Options, Weighted-Average Remaining Life (Years)	1 year 6 months
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 41.09
$50.00 – $59.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit (USD per share)	50.00
Range of Exercise Prices, upper limit (USD per share)	$ 59.99
Number of Outstanding Options (in shares)	15,000
Outstanding Options, Weighted-Average Remaining Life (Years)	6 years 2 months 12 days
Outstanding Options, Weighted-Average Exercise Price (dollars per share)	$ 56.76
Number of Exercisable Options (in shares)	15,000
Exercisable Options, Weighted-Average Remaining Life (Years)	6 years 2 months 12 days
Exercisable Options, Weighted-Average Exercise Price (dollars per share)	$ 56.76