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Fair Value of financial instruments - Additional Information (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Estimate of Fair Value Measurement | Senior Secured Credit Facilities  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt value $ 5,064,405
Estimate of Fair Value Measurement | Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt value 4,391,600
Reported Value Measurement | Senior Secured Credit Facilities  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt value 5,015,669
Reported Value Measurement | Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Long-term debt value $ 4,463,430