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Pension Plans - Components of Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Compensation And Retirement Disclosure [Abstract]    
Service cost $ 23 $ 37
Interest cost 340 312
Expected return on plan assets (449) (367)
Recognized net actuarial loss 3 124
Net periodic benefit (income) expense $ (83) $ 106