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Borrowing Arrangements - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 14, 2010
Jun. 04, 2010
Bank
Apr. 11, 2010
Apr. 11, 2011
Dec. 31, 2013
Debt
Dec. 31, 2012
Sep. 27, 2010
2010 Convertible Senior Subordinated Notes [Member]
Sep. 27, 2010
2010 Convertible Senior Subordinated Notes [Member]
Days
Dec. 31, 2013
2010 Convertible Senior Subordinated Notes [Member]
Dec. 31, 2012
2010 Convertible Senior Subordinated Notes [Member]
Sep. 27, 2010
2006 Convertible Senior Subordinated Notes [Member]
May 30, 2006
2006 Convertible Senior Subordinated Notes [Member]
Dec. 31, 2013
2006 Convertible Senior Subordinated Notes [Member]
Dec. 31, 2012
2006 Convertible Senior Subordinated Notes [Member]
Jun. 01, 2011
2006 Convertible Senior Subordinated Notes [Member]
Debt Instrument [Line Items]                              
Primary debt arrangements         2                    
Convertible Senior Subordinated Notes             $ 130,000,000 $ 130,000,000 $ 130,000,000     $ 100,000,000      
Unsecured credit facility   275,000,000     275,000,000                    
Notes payable terms               Semi-annually in arrears on April 1 and October 1 beginning April 1, 2011       Semi-annually in arrears on each June 1 and December 1      
Interest rate on Notes             4.875% 4.875%       3.125%      
Maturity date of Notes               Oct. 01, 2015         Jun. 01, 2026    
Notes payable beginning date               Apr. 01, 2011              
Rate for conversion of notes into common stock               134.9255       94.1035      
Principal amount of notes             1,000 1,000 130,000,000 130,000,000   1,000 750,000 750,000  
Initial conversion price per share             $ 7.41 $ 7.41       $ 10.63      
Conversion value lesser than principal amount               1,000       1,000      
Conversion value exceeds principal amount               1,000       1,000      
Debt instrument, convertible, Date               Jul. 31, 2015              
Debt Instrument, convertible, least trading days               20              
Debt instrument, convertible, consecutive trading days               30 days              
Debt instrument, convertible, minimum percentage of stock price               135.00%              
Percentage of principal amount for calculation of repurchase price             100.00%       100.00%        
Amortized discount at annual effective rate             7.50%                
Discount, period of issuance             5 years                
Remaining period for amortization of discount                 21 months            
Convertible notes retired                     60,000,000       39,300,000
Group of participating banks   7                          
Proceeds from convertible notes used to repurchase common stock 30,000,000                            
Maturity of credit facility, extended period     1 year                        
Maturity date of credit facility       2015-06                      
Outstanding balance under credit facility         48,500,000 208,900,000                  
Approximately available funds under credit facility         $ 99,800,000