Supplemental Condensed Consolidating Financial Information (Condensed Consolidating Statement of Operations) (Additional Information) (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Condensed Financial Information of Parent Company Only Disclosure [Abstract] | |||
| Stock-based compensation expense | $ 21,033 | $ 17,638 | $ 10,804 |