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Share Based Compensation - Schedule of Information with Respect to Outstanding and Exercisable Stock Options (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 2,657,723 | 3,781,964 | 3,900,435 | 2,591,887
Options Outstanding, Weighted Average Exercise Price | $ 14.27 | $ 12.88 | $ 15.15 | $ 25.96
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 4 years 11 months 9 days |  |  |
Options Exercisable, Number Exercisable | 1,819,466 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 18.71 |  |  |
Range of Exercise Prices $2.65 - $2.82 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 2.65 |  |  |
Range of Exercise Prices, Maximum | $ 2.82 |  |  |
Options Outstanding, Number of Options Outstanding | 285,416 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 2.74 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 7 years 1 month 17 days |  |  |
Options Exercisable, Number Exercisable | 176,708 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 2.76 |  |  |
Range of Exercise Prices $3.93 - $4.15 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 3.93 |  |  |
Range of Exercise Prices, Maximum | $ 4.15 |  |  |
Options Outstanding, Number of Options Outstanding | 467,364 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 4.06 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 9 years 6 months 22 days |  |  |
Range of Exercise Prices $5.00 - $6.51 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | $ 5.00 |  |  |
Range of Exercise Prices, Maximum | $ 6.51 |  |  |
Options Outstanding, Number of Options Outstanding | 269,474 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 6.04 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 7 years 10 months 13 days |  |  |
Options Exercisable, Number Exercisable | 101,701 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 6.43 |  |  |
Range of Exercise Prices $7.33 - $7.33 [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 | $ 7.33 |  |  |
Options Outstanding, Number of Options Outstanding | 151,230 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 7.33 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 6 years 4 months 13 days |  |  |
Options Exercisable, Number Exercisable | 62,874 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 7.33 |  |  |
Range of Exercise Prices $8.63 - $8.63 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 8.63 |  |  |
Range of Exercise Prices, Maximum | $ 8.63 |  |  |
Options Outstanding, Number of Options Outstanding | 291,563 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 8.63 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 1 year 7 months 21 days |  |  |
Options Exercisable, Number Exercisable | 285,507 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 8.63 |  |  |
Range of Exercise Prices $13.32 - $21.80 [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 | $ 21.80 |  |  |
Options Outstanding, Number of Options Outstanding | 335,112 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 17.66 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 2 years 7 months 2 days |  |  |
Options Exercisable, Number Exercisable | 335,112 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 17.66 |  |  |
Range of Exercise Prices $22.04 - $22.13 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 22.04 |  |  |
Range of Exercise Prices, Maximum | $ 22.13 |  |  |
Options Outstanding, Number of Options Outstanding | 276,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 22.08 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 3 years 6 months 7 days |  |  |
Options Exercisable, Number Exercisable | 276,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 22.08 |  |  |
Range of Exercise Prices $26.15 - $30.67 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 26.15 |  |  |
Range of Exercise Prices, Maximum | $ 30.67 |  |  |
Options Outstanding, Number of Options Outstanding | 305,564 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 29.50 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 3 years 3 months 7 days |  |  |
Options Exercisable, Number Exercisable | 305,564 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 29.50 |  |  |
Range of Exercise Prices $30.80 - $33.96 [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 | $ 33.96 |  |  |
Options Outstanding, Number of Options Outstanding | 258,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 32.30 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 9 months 29 days |  |  |
Options Exercisable, Number Exercisable | 258,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 32.30 |  |  |
Range of Exercise Prices $34.86 - $34.86 [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 | $ 34.86 |  |  |
Options Outstanding, Number of Options Outstanding | 18,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 34.86 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 1 month 13 days |  |  |
Options Exercisable, Number Exercisable | 18,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 34.86 |  |  |

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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. + 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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