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Financing Arrangements (Convertible Senior Notes) - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
Aug. 29, 2013
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Aug. 29, 2012
Debt Instrument [Line Items]          
Convertible senior notes         $ 112,500
Convertible senior notes interest rate         3.75%
Convertible senior notes due date Aug. 15, 2019        
Convertible senior notes, transactional fees     3,539    
Convertible notes, net (Note 3)   107,656 107,656 107,133  
Convertible senior notes, unamortized discount   4,844 4,844 5,367  
Convertible senior notes, remaining amortization period   5 years 10 months 28 days 5 years 10 months 28 days    
Convertible senior notes, total interest and amortization expense recognized   1,234 3,673    
Convertible senior notes convertible latest date     Aug. 15, 2019    
Initial conversion rate, number of common stock issuable     0.1333333    
Conversion price per share   $ 7.50 $ 7.50    
Debt Conversion, maximum number of common stock shares     15,000    
Repurchase price as percentage of principal amount of senior notes     100.00%    
Price to redeem notes as percentage of principal     100.00%    
Notes redemption earliest date     Aug. 15, 2015    
Unamortized debt issuance costs
         
Debt Instrument [Line Items]          
Unamortized, transaction Fees   2,992 2,992 3,365  
Unamortized debt issuance costs | Other Current Assets
         
Debt Instrument [Line Items]          
Unamortized, transaction Fees   506 506 505  
Unamortized debt issuance costs | Other Long Term Assets
         
Debt Instrument [Line Items]          
Unamortized, transaction Fees   $ 2,486 $ 2,486 $ 2,860