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Annual Benefit Payments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments in 2013 $ 108
Expected future benefit payments in 2014 108
Expected future benefit payments in 2015 108
Expected future benefit payments in 2016 108
Expected future benefit payments in 2017 108
Expected future benefit payments in Years 2018 - 2022 $ 538