Annual report pursuant to Section 13 and 15(d)

Retirement Plans and Related Post Retirement Benefits - Reconciliation of Beginning and Ending Balances of Projected Benefit Obligation (Detail)

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Retirement Plans and Related Post Retirement Benefits - Reconciliation of Beginning and Ending Balances of Projected Benefit Obligation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SERP [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Beginning of the Year - January 1 $ 15,042 $ 7,588  
Adoption of SERP II    5,790  
Service Cost 295 303 46
Interest Cost 624 548 328
Actuarial (Gain) Loss (1,299) 1,161  
Benefits Paid (348) (348)  
End of the Year - December 31 14,314 15,042 7,588
SERP Medical [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Beginning of the Year - January 1 593 568  
Service Cost 3 2 2
Interest Cost 24 24 27
Actuarial (Gain) Loss 55 42  
Benefits Paid (45) (43)  
End of the Year - December 31 $ 630 $ 593 $ 568