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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Debt instrument, carrying amount $ 9,209,771 $ 9,226,330
Senior Secured Credit Facilities    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Debt instrument, carrying amount 4,351,250  
Debt instrument, fair value 4,358,000  
Senior Notes    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Debt instrument, carrying amount 4,500,000  
Debt instrument, fair value $ 4,557,000