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Fair Value of Financial Instruments - Additional Information (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
Estimate of Fair Value Measurement | Senior Secured Credit Facilities  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt, fair value $ 4,240,812
Estimate of Fair Value Measurement | Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt, fair value 4,565,875
Reported Value Measurement | Senior Secured Credit Facilities  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt, fair value 4,148,123
Reported Value Measurement | Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt, fair value $ 4,500,000