Annual report pursuant to Section 13 and 15(d)

Retirement Plans and Related Post Retirement Benefits - Summarizes the Components of the Net Periodic Cost (Detail)

v2.4.0.8
Retirement Plans and Related Post Retirement Benefits - Summarizes the Components of the Net Periodic Cost (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SERP [Member]
     
Net Periodic Cost      
Service Cost - Benefits Earned During Period $ 295 $ 303 $ 46
Interest Cost 624 548 328
Amortization of Prior Service Cost 495 426 109
Amortization of (Gains) Losses 128 91 11
Net Periodic Cost 1,542 1,368 494
SERP Medical [Member]
     
Net Periodic Cost      
Service Cost - Benefits Earned During Period 3 2 2
Interest Cost 24 24 27
Amortization of Prior Service Cost 25 26 25
Amortization of (Gains) Losses     (4)
Net Periodic Cost $ 52 $ 52 $ 50