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Debt Facilities - Schedule of Convertible Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2009
Debt Instrument [Line Items]        
Interest rate (percent)     8.125%  
Long term debt, gross $ 1,243,699 $ 593,471    
Less the amount representing debt discount and debt issuance cost (2,681) $ (3,477)    
Total long term debt $ 5,245,768      
4.75% Convertible Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Interest rate (percent) 4.75% 4.75% 4.75%  
Convertible Subordinated Debt [Member] | 4.75% Convertible Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Interest rate (percent)       4.75%
Long term debt, gross $ 150,082 $ 157,885    
Less the amount representing debt discount and debt issuance cost (3,961) (12,656)    
Total long term debt $ 146,121 $ 145,229