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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 | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 01, 2015 | Oct. 30, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non operating charge included in other income, net |  |  | $ 2,706,000 | $ (1,673,000) | $ (1,126,000) | $ 2,859,000 | $ 2,350,000 | $ (1,368,000) | $ 3,936,000 | $ 1,975,000 |  | $ 2,766,000 | $ 6,893,000 | $ 7,817,000
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non operating charge included in other income, net |  |  |  |  |  |  |  |  |  |  |  | 800,000 | 1,500,000 |
2010 Convertible Senior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 48,400,000 |  | $ 48,400,000 |  |  |  | $ 97,650,000 |  |  |  |  | $ 48,400,000 | $ 97,650,000 |
Conversion rate per $ 1,000 principal of convertible notes | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion value of Notes |  | $ 71,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of notes |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2015 |  |
Shares issued in exchange for partial retirement of debt |  |  |  |  | 5.1 |  |  |  |  |  | 1.5 | 5.1 | 1.5 |
Partial extinguishment of debt |  |  |  |  | $ 49,300,000 |  |  |  |  |  | $ 32,400,000 | $ 49,300,000 | $ 32,400,000 |
Common stock equivalent impact |  |  |  |  |  |  |  |  |  |  |  | 1.2 | 2.0 |

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