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Debt - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Apr. 27, 2015
Mar. 13, 2014
Apr. 01, 2009
Mar. 31, 2009
Mar. 30, 2014
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument                  
Term of loan, years 5 years     5 years          
Pledge percentage of capital stock 65.00%                
Borrowings from local bank       $ 10,000,000          
Debt instrument, interest rate, stated percentage       0.80%          
Loan collateralized by real estate mortgage       $ 6,000,000          
Unsecured loan       4,000,000          
Semiannual principal payments of loan         $ 1,000,000 $ 1,000,000      
Payments of long-term debt               $ 190,972,000 $ 2,534,000
Common stock shares were issued for warrants exercised               21,200,000  
Strike price per share of warrant               $ 7.6348  
Maximum                  
Debt Instrument                  
Aggregate principal amount $ 150,000,000                
Commitment fee percentage of unused portion of credit facility 0.35%                
Minimum                  
Debt Instrument                  
Commitment fee percentage of unused portion of credit facility 0.125%                
Base Rate | Maximum                  
Debt Instrument                  
Debt instrument, basis spread on variable rate 1.00%                
Base Rate | Minimum                  
Debt Instrument                  
Debt instrument, basis spread on variable rate 0.00%                
London Interbank Offered Rate (LIBOR) | Maximum                  
Debt Instrument                  
Debt instrument, basis spread on variable rate 2.00%                
London Interbank Offered Rate (LIBOR) | Minimum                  
Debt Instrument                  
Debt instrument, basis spread on variable rate 1.00%                
Revolving Credit Facility                  
Debt Instrument                  
Financing cost             $ 2,300,000    
Financing cost, amortization term             5 years    
Revolving Credit Facility | Maximum                  
Debt Instrument                  
Credit facility, borrowing capacity $ 350,000,000                
4.50% Convertible Senior Notes Due March 15, 2014                  
Debt Instrument                  
Aggregate principal amount     $ 190,000,000 $ 175,000,000          
Debt instrument, interest rate, stated percentage       4.50%          
Additional aggregate principal amount     $ 15,000,000 $ 1,000          
Senior notes maturity date     Mar. 15, 2014 Mar. 15, 2014          
Conversion rate in number of shares       182.65     131.95    
Number of shares excluded for conversion rate calculation             50.7    
Trading days used to determine average price per share             25 days    
Average trading price of common shares             $ 19.74    
Payments of long-term debt             $ 190,000,000    
Stock issued in conversion of notes             25,100,000    
Stock received and retired   25,100,000