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Debt and Financing Arrangements (2010 Notes) - Additional Information (Detail) - USD ($) shares in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2015 | Sep. 27, 2010 | Oct. 30, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Non operating charge included in other income (expense), net |  |  |  | $ (1,673,000) |  | $ (1,368,000) | $ 60,000 | $ 4,543,000 |
2010 Convertible Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  | $ 48,373,000 |  |  | $ 48,373,000 |  | $ 97,650,000
Common stock equivalent impact |  |  |  | 1.6 |  |  | 1.3 |  |
Shares issued in exchange for partial retirement of debt |  |  |  |  |  |  | 5.1 |  |
Partial extinguishment of debt |  |  |  |  |  |  | $ 49,300,000 |  |
Interest expense annualized basis |  |  |  |  |  |  | $ 3,200,000 |  |
Non operating charge included in other income (expense), net |  |  |  |  | $ 800,000 |  |  |  |
Amortized discount at annual effective rate |  | 7.50% |  |  |  |  |  |  |
Discount, period of issuance |  | 5 years |  |  |  |  |  |  |
2010 Convertible Senior Subordinated Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 48,400,000 |  |  |  |  |  |  |  |
Conversion rate per $ 1,000 principal of convertible notes | $ 1,000 |  |  |  |  |  |  |  |
Conversion value of Notes |  |  | $ 71,800,000 |  |  |  |  |  |

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