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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