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Fair Value Measurements - Additional Information (Detail) (USD $)
Jun. 30, 2013
Receivables
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Number of bonds received 2  
Total Debt $ 1,154,663,000 $ 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 360,000,000  
Interest rate of Senior Notes 3.75%  
Total Debt 340,376,000 333,039,000
Fair value of the convertible notes 358,000,000  
Bonds Series A and Series B [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Number of bonds received 2  
Bonds A Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 90,700,000  
Maturity date of notes receivable Jul. 01, 2034  
Bonds B Series [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivables, carrying value 61,300,000  
Maturity date of notes receivable Sep. 01, 2037  
Notes receivable, fair value $ 42,000,000