The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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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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.

+ References

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Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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

+ References

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-Publisher FASB

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Weighted average remaining contractual term for option awards outstanding, 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 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

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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

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Share Based Compensation - Schedule of Information with Respect to 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]
Options Outstanding, Number of Options Outstanding	3,781,964	3,900,435	2,591,887	3,353,462
Options Outstanding, Weighted Average Exercise Price	$ 12.88	$ 15.15	$ 25.96	$ 27.79
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 9 months 18 days
Options Exercisable, Number Exercisable	2,138,086
Options Exercisable, Weighted Average Exercise Price	$ 18.87
Range of Exercise Prices $2.20 - $2.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.20
Range of Exercise Prices, Maximum	$ 2.20
Options Outstanding, Number of Options Outstanding	644,628
Options Outstanding, Weighted Average Exercise Price	$ 2.20
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 years 3 months 7 days
Options Exercisable, Number Exercisable	161,157
Options Exercisable, Weighted Average Exercise Price	$ 2.20
Range of Exercise Prices $2.62 - $2.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.62
Range of Exercise Prices, Maximum	$ 2.65
Options Outstanding, Number of Options Outstanding	96,729
Options Outstanding, Weighted Average Exercise Price	$ 2.65
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 years 7 months 10 days
Options Exercisable, Number Exercisable	26,403
Options Exercisable, Weighted Average Exercise Price	$ 2.64
Range of Exercise Prices $2.72 - $2.72 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.72
Range of Exercise Prices, Maximum	$ 2.72
Options Outstanding, Number of Options Outstanding	403,504
Options Outstanding, Weighted Average Exercise Price	$ 2.72
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4 years 10 months 17 days
Options Exercisable, Number Exercisable	269,626
Options Exercisable, Weighted Average Exercise Price	$ 2.72
Range of Exercise Prices $2.82 - $6.81 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 2.82
Range of Exercise Prices, Maximum	$ 6.81
Options Outstanding, Number of Options Outstanding	628,327
Options Outstanding, Weighted Average Exercise Price	$ 5.49
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 years 8 months 19 days
Options Exercisable, Number Exercisable	148,344
Options Exercisable, Weighted Average Exercise Price	$ 4.62
Range of Exercise Prices $7.33 - $8.63 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 7.33
Range of Exercise Prices, Maximum	$ 8.63
Options Outstanding, Number of Options Outstanding	590,500
Options Outstanding, Weighted Average Exercise Price	$ 7.98
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	6 years 11 days
Options Exercisable, Number Exercisable	132,933
Options Exercisable, Weighted Average Exercise Price	$ 8.63
Range of Exercise Prices $13.32 - $22.04 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 13.32
Range of Exercise Prices, Maximum	$ 22.04
Options Outstanding, Number of Options Outstanding	503,112
Options Outstanding, Weighted Average Exercise Price	$ 19.12
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	3 years 11 months 12 days
Options Exercisable, Number Exercisable	484,459
Options Exercisable, Weighted Average Exercise Price	$ 19.02
Range of Exercise Prices $22.13 - $30.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 22.13
Range of Exercise Prices, Maximum	$ 30.67
Options Outstanding, Number of Options Outstanding	413,564
Options Outstanding, Weighted Average Exercise Price	$ 27.57
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4 years 11 months 23 days
Options Exercisable, Number Exercisable	413,564
Options Exercisable, Weighted Average Exercise Price	$ 27.57
Range of Exercise Prices $30.80 - $34.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 30.80
Range of Exercise Prices, Maximum	$ 34.70
Options Outstanding, Number of Options Outstanding	454,350
Options Outstanding, Weighted Average Exercise Price	$ 33.18
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	1 year 3 months 7 days
Options Exercisable, Number Exercisable	454,350
Options Exercisable, Weighted Average Exercise Price	$ 33.18
Range of Exercise Prices $34.86 - $37.76 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 34.86
Range of Exercise Prices, Maximum	$ 37.76
Options Outstanding, Number of Options Outstanding	46,750
Options Outstanding, Weighted Average Exercise Price	$ 35.30
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 months 12 days
Options Exercisable, Number Exercisable	46,750
Options Exercisable, Weighted Average Exercise Price	$ 35.30
Range of Exercise Prices $38.28 - $38.28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 38.28
Range of Exercise Prices, Maximum	$ 38.28
Options Outstanding, Number of Options Outstanding	500
Options Outstanding, Weighted Average Exercise Price	$ 38.28
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	6 months 4 days
Options Exercisable, Number Exercisable	500
Options Exercisable, Weighted Average Exercise Price	$ 38.28