|
Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Debt instrument, carrying amount | $ 8,519,642 | $ 8,433,603 |
| Senior Secured Credit Facilities | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Debt instrument, carrying amount | 4,441,292 | |
| Debt instrument, fair value | 4,420,238 | |
| Senior Notes | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Debt instrument, carrying amount | 3,775,000 | |
| Debt instrument, fair value | $ 3,924,715 |