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Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plan [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 102 $ 111
Interest cost 83 76
Expected return on plan assets (74) (79)
Amortization of net loss 21 22
Net periodic benefit cost $ 132 $ 130