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Fair Value Measurements - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Debt $ 1,154,420,000 $ 1,031,863,000
3.75% Convertible Senior Notes [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Face amount of outstanding debt 304,100,000  
Interest rate of Senior Notes 3.75%  
Total Debt 293,962,000 333,039,000
Maturity year of note 2014  
Fair value of the convertible notes 308,000,000  
Bonds A Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 88,900,000  
Bonds B Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 59,500,000  
Notes receivable, fair value $ 38,000,000