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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Number of notes receivable 2  
Total Debt $ 1,154,046,000 $ 1,154,420,000
Bonds A Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 87,200,000  
Maturity date Jul. 01, 2034  
Bonds B Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 60,800,000  
Notes receivable, fair value 39,000,000  
Maturity date Sep. 01, 2037  
5% Senior Notes [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Face amount of outstanding debt 350,000,000  
Interest rate of Senior Notes 5.00% 5.00%
Total Debt 350,000,000 350,000,000
Fair value of Senior Notes 352,600,000  
Due of Senior Notes 2021  
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% 3.75%
Total Debt 297,236,000 293,962,000
Fair value of the convertible notes $ 310,000,000  
Due of Senior Notes 2014