Fair Value of Financial Instruments - Additional Information (Detail) $ in Thousands	Mar. 31, 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	$ 4,300,460
Estimate of Fair Value Measurement | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, fair value	4,568,650
Reported Value Measurement | Senior Secured Credit Facilities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, fair value	4,171,638
Reported Value Measurement | Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 4,500,000