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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Debt instrument, carrying amount $ 9,192,229 $ 9,226,330
Senior Secured Credit Facilities    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Debt instrument, carrying amount 4,217,348  
Debt instrument, fair value 4,336,969  
Senior Notes    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Debt instrument, carrying amount 4,500,000  
Debt instrument, fair value $ 4,530,875