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Summarized Information of Stock Options Outstanding (Detail) (USD $) | 9 Months Ended
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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. + Details
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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 + Details
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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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a, b) -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. + Details
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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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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