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Retirement Plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net (gain) loss $ (138) $ (333) $ (502)
Transition obligation 0 1 2
Total (138) (332) (500)
Postretirement Benefits [Member]
     
Net (gain) loss (7)    
Transition obligation 0    
Total $ (7)