Stock-Based Compensation - Unrecognized Compensation Costs Related to Non-Vested Stock-Based Awards Granted (Detail) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
|
Dec. 31, 2013
|
---|---|---|
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||
Total unrecognized compensation costs | $ 11,007 | $ 9,711 |