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Pension Plans - Accumulated Benefit Obligations in Excess of Plan Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets [Abstract]    
Accumulated benefit obligation $ 27,525 $ 31,590
Fair market value of assets $ 22,499 $ 18,406