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Summarized Information of Stock Options Outstanding (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	2,997,000
Options Outstanding, Average Remaining Contractual Life	6 years 1 month 24 days
Options Outstanding, Weighted Average Exercise Price Per Share	$ 12.43
Options Exercisable, Number	1,359,000
Options Exercisable, Weighted Average Exercise Price	$ 8.90
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	$ 2.41
Exercise Price Range, Upper Limit	$ 3.68
Options Outstanding, Number	399,000
Options Outstanding, Average Remaining Contractual Life	10 months 6 days
Options Outstanding, Weighted Average Exercise Price Per Share	$ 3.24
Options Exercisable, Number	399,000
Options Exercisable, Weighted Average Exercise Price	$ 3.24
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	$ 6.07
Options Outstanding, Number	267,000
Options Outstanding, Average Remaining Contractual Life	2 years 2 months 27 days
Options Outstanding, Weighted Average Exercise Price Per Share	$ 6.07
Options Exercisable, Number	267,000
Options Exercisable, Weighted Average Exercise Price	$ 6.07
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	$ 10.39
Options Outstanding, Number	410,000
Options Outstanding, Average Remaining Contractual Life	6 years 3 months 7 days
Options Outstanding, Weighted Average Exercise Price Per Share	$ 10.39
Options Exercisable, Number	196,000
Options Exercisable, Weighted Average Exercise Price	$ 10.39
Range Four
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	$ 13.93
Exercise Price Range, Upper Limit	$ 14.31
Options Outstanding, Number	869,000
Options Outstanding, Average Remaining Contractual Life	6 years 5 months 27 days
Options Outstanding, Weighted Average Exercise Price Per Share	$ 14.16
Options Exercisable, Number	420,000
Options Exercisable, Weighted Average Exercise Price	$ 14.09
Range Five
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Limit	$ 16.11
Exercise Price Range, Upper Limit	$ 17.50
Options Outstanding, Number	1,052,000
Options Outstanding, Average Remaining Contractual Life	8 years 9 months 29 days
Options Outstanding, Weighted Average Exercise Price Per Share	$ 16.89
Options Exercisable, Number	77,000
Options Exercisable, Weighted Average Exercise Price	$ 16.11

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- Definition

Share Based Compensation Share Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price.

+ References

No definition available.

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- Definition

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

+ 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)(iii)

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

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- Definition

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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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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