Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Debt instrument, carrying amount | $ 9,208,653 | $ 9,226,330 |
| Senior Secured Credit Facilities | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Debt instrument, carrying amount | 4,302,500 | |
| Debt instrument, fair value | 4,344,000 | |
| Senior Notes | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Debt instrument, carrying amount | 4,500,000 | |
| Debt instrument, fair value | $ 4,594,000 |