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Convertible Senior Notes - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 01, 2014
Jan. 31, 2016
Jun. 30, 2014
Jul. 31, 2013
Nov. 30, 2009
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]                  
Long term debt, face amount           $ 206,865 $ 215,000    
Gain on debt extinguishment           98      
Other long term assets           2,156 3,125    
Convertible senior notes, net           $ 203,007 209,166    
ASU 2015-03 | Restatement Adjustment                  
Debt Instrument [Line Items]                  
Other long term assets             (5,800)    
Convertible senior notes, net             5,800    
4.50% Convertible senior notes (due 2014)                  
Debt Instrument [Line Items]                  
Long term debt, face amount         $ 100,000        
Frequency of interest payment           Semi-annually      
Debt instrument, maturity date         Nov. 01, 2014        
Debt instrument, interest rate         4.50%        
Debt discount         $ 13,700        
Interest expenses associated with amortization of equity component           $ 0 0 $ 900  
Debt issuance cost written off amount                 $ 600
Repurchase of related equity component                 2,800
Debt discount written off amount                 $ 2,200
Repayments of debt $ 39,000                
4.25% Convertible Senior Notes (due 2018)                  
Debt Instrument [Line Items]                  
Long term debt, face amount       $ 100,000   $ 93,865 $ 100,000    
Frequency of interest payment           Semi-annually      
Debt instrument, maturity date       Aug. 01, 2018          
Debt instrument, interest rate       4.25%   4.25% 4.25%    
Gain on debt extinguishment       $ 100          
Debt issuance cost written off amount           $ 100      
Conversion rate in share per $1000 principal amount of notes       114.3674          
Debt instrument, conversion rate       $ 8.74          
Debt instrument repurchase amount           6,100      
Convertible senior notes, net           92,767 $ 97,819    
4.875% Convertible Senior Notes (due 2020)                  
Debt Instrument [Line Items]                  
Long term debt, face amount     $ 115,000     $ 113,000 $ 115,000    
Frequency of interest payment           Semi-annually      
Debt instrument, maturity date     Jun. 01, 2020            
Debt instrument, interest rate     4.875%     4.875% 4.875%    
Gain on debt extinguishment   $ 100              
Debt issuance cost written off amount   100              
Conversion rate in share per $1000 principal amount of notes     103.7613            
Debt instrument, conversion rate     $ 9.64            
Debt instrument repurchase amount   $ 2,000              
Convertible senior notes, net           $ 110,240 $ 111,347