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Financing Arrangements (Convertible Senior Notes) - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
Aug. 29, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
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       3,537      
Convertible notes, net (Note 3)   108,386   108,386   107,835  
Convertible senior notes, unamortized discount   4,114   4,114   4,665  
Convertible senior notes, remaining amortization period       4 years 10 months 27 days      
Convertible senior notes, total interest and amortization expense recognized   1,241 1,233 3,715 3,673    
Convertible senior notes convertible latest date       Aug. 15, 2019      
Initial conversion rate, number of common stock issuable       0.1333333      
Debt Conversion, maximum number of common stock shares       15,000,000      
Conversion price per share   $ 7.50   $ 7.50      
Repurchase price as percentage of principal amount of senior notes       100.00%      
Notes redemption earliest date       Aug. 15, 2015      
Price to redeem notes as percentage of principal       100.00%      
Unamortized debt issuance costs
             
Debt Instrument [Line Items]              
Unamortized, transaction Fees   2,526   2,526   2,863  
Unamortized debt issuance costs | Other Current Assets
             
Debt Instrument [Line Items]              
Unamortized, transaction Fees   505   505   505  
Unamortized debt issuance costs | Other Long Term Assets
             
Debt Instrument [Line Items]              
Unamortized, transaction Fees   $ 2,021   $ 2,021   $ 2,358