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Fair Value Measurements - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
6 Months Ended 3 Months Ended
Jun. 30, 2014
Note
Dec. 31, 2013
Jun. 30, 2014
Bonds A Series [Member]
Jun. 30, 2014
Bonds B Series [Member]
Jun. 30, 2014
3.75% Convertible Senior Notes [Member]
Dec. 31, 2013
3.75% Convertible Senior Notes [Member]
Sep. 30, 2014
3.75% Convertible Senior Notes [Member]
Forecast [Member]
Additional Warrant [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Warrants repurchased         2.4   2.4
Notes receivables, carrying value     $ 88,900,000 $ 62,100,000      
Notes receivable, fair value       40,000,000      
Maturity date     Jul. 01, 2034 Sep. 01, 2037      
Number of notes receivable 2            
Face amount of outstanding debt         232,200,000    
Interest rate of Senior Notes         3.75% 3.75%  
Total Debt 1,280,122,000 1,154,420,000     229,461,000 293,962,000  
Fair value of the convertible notes         $ 234,000,000