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Employee Benefit Plans - Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Employee Benefit Plan [Line Items]    
Net actuarial loss $ (1,667) $ (1,502)
Transition obligation 0 (7)
Tax effect 583 528
Accumulated Other Comprehensive Income (Loss) [Member]
    
Employee Benefit Plan [Line Items]    
Actuarial loss (1,667) (1,509)
Employee Benefit Plan [Member]
    
Employee Benefit Plan [Line Items]    
Other comprehensive income (loss) $ (1,084) $ (981)