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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
Aug. 29, 2013
Mar. 31, 2014
Mar. 31, 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)   108,017   107,835  
Convertible senior notes, unamortized discount   4,483   4,665  
Convertible senior notes, remaining amortization period   5 years 4 months 28 days      
Convertible senior notes, total interest and amortization expense recognized   1,236 1,209    
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      
Debt Conversion, maximum number of common stock shares   15,000,000      
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   2,737   2,863  
Unamortized debt issuance costs | Other Current Assets
         
Debt Instrument [Line Items]          
Unamortized, transaction Fees   505      
Unamortized debt issuance costs | Other Long Term Assets
         
Debt Instrument [Line Items]          
Unamortized, transaction Fees   $ 2,232   $ 2,358