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Fair Value Measurements - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Debt $ 1,031,863,000 $ 1,073,825,000
3.75% Convertible Notes Payable [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Face amount of outstanding debt 360,000,000  
Interest rate of Senior Notes 3.75% 3.75%
Total Debt 333,039,000 319,246,000
Fair value of the convertible notes 346,000,000  
Maturity year of note 2014  
6.75% Senior Notes [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Face amount of outstanding debt 225,000,000  
Interest rate of Senior Notes 6.75% 6.75%
Total Debt 152,180,000 152,180,000
Maturity year of note 2014  
Fair value of senior notes 152,200,000  
Bonds A Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 90,600,000  
Bonds B Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 58,800,000  
Notes receivable, fair value $ 40,000,000