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Retirement Plans - Schedule of Changes in Benefit Obligations and Plan Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Service cost $ 0 $ 0 $ 0
Interest cost 75 86 128
Funded Status at End of Year 1,986 1,892  
Unrecognized transition obligation 0 (2)  
Unrecognized net gain 212 513  
Amounts recognized in retained earnings 2,198 2,403  
Change in Benefit Obligation [Member]
      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Benefit obligation at beginning of year 1,892 1,897  
Service cost 0 0  
Interest cost 75 86  
Amendments 0 0  
Actuarial gain 269 210  
Net benefits paid (250) (301)  
Benefit obligation at end of year 1,986 1,892  
Change in Plan Assets [Member]
      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 250 301  
Net benefits paid (250) (301)  
Fair value of plan assets at end of year $ 0 $ 0