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Additional Information Regarding Options Outstanding (Detail) (USD $)
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12 Months Ended | |||||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2013
$ 0.36 - $ 3.00
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Dec. 31, 2013
$ 3.01 - $ 6.00
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Dec. 31, 2013
$ 6.01 - $ 9.00
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Dec. 31, 2013
$ 9.01 - $ 12.00
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Dec. 31, 2013
$ 12.01 - $ 15.00
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Dec. 31, 2013
$ 15.01 - $ 18.00
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Dec. 31, 2013
$ 18.01 - $ 21.00
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Dec. 31, 2013
$ 21.01 - $ 24.00
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Dec. 31, 2013
$ 24.01 - $ 25.50
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Dec. 31, 2013
$ 0.36 - $ 25.50
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||
| Range of Exercise Prices, Lower Limit | $ 0.36 | $ 3.01 | $ 6.01 | $ 9.01 | $ 12.01 | $ 15.01 | $ 18.01 | $ 21.01 | $ 24.01 | $ 0.36 | ||||
| Range of Exercise Prices, Upper Limit | $ 3.0 | $ 6.0 | $ 9.0 | $ 12.0 | $ 15.0 | $ 18.0 | $ 21.0 | $ 24.0 | $ 25.5 | $ 25.5 | ||||
| Options | 2,162,067 | 1,927,099 | 1,640,392 | 1,151,998 | 997,166 | 289,625 | 728,250 | 70,050 | 58,475 | 13,876 | 4,625 | 2,162,067 | ||
| Weighted Average Contractual Life Remaining (Years) | 5 years 10 months 24 days | 3 years 10 months 24 days | 6 years 6 months | 1 year 2 months 12 days | 10 months 24 days | 4 months 24 days | 10 months 24 days | 0 years | 0 years | 5 years 6 months | ||||
| Weighted Average Exercise Price | $ 5.09 | $ 4.37 | $ 5.01 | $ 6.83 | $ 2.51 | $ 5.15 | $ 6.93 | $ 11.80 | $ 13.88 | $ 16.75 | $ 18.89 | $ 5.09 | ||
| Exercisable Options | 514,751 | 707,024 | 655,228 | 196,000 | 171,725 | 70,050 | 58,475 | 13,876 | 4,625 | 514,751 | ||||
| Weighted Average Exercise Price | $ 6.29 | $ 6.58 | $ 7.56 | $ 2.00 | $ 5.17 | $ 11.80 | $ 13.88 | $ 16.75 | $ 18.89 | $ 6.29 | ||||
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
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
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| X | ||||||||||
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- Definition
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
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| X | ||||||||||
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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