Quarterly report pursuant to Section 13 or 15(d)

Restricted Common Stock and Stock Appreciation Rights ("SARs") - Fair Value of Stock and SARs Vested (Detail)

v2.4.0.8
Restricted Common Stock and Stock Appreciation Rights ("SARs") - Fair Value of Stock and SARs Vested (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Restricted common stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value vested during the period $ 470 $ 695
SARs [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value vested during the period $ 405 $ 566