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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument, carrying amount $ 9,226,330 $ 8,519,642
Senior Secured Credit Facilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument, carrying amount 4,372,500  
Debt instrument, fair value 4,370,188  
Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument, carrying amount 4,500,000  
Debt instrument, fair value $ 4,463,750