Changes in Goodwill (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Goodwill [Roll Forward] | ||
| Goodwill | $ 1,583,564 | $ 1,586,482 |
| Accumulated impairment losses | (329,741) | (329,741) |
| Beginning Balance, Subtotal | 1,253,823 | 1,256,741 |
| Acquisitions | 0 | 886 |
| Purchase price allocation adjustments | 371 | (3,188) |
| Disposition | (1,129) | (616) |
| Impairment losses | (549,711) | 0 |
| Goodwill | 1,582,806 | 1,583,564 |
| Accumulated impairment losses | (879,452) | (329,741) |
| Ending Balance, Subtotal | $ 703,354 | $ 1,253,823 |