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Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 103 $ 112 $ 205 $ 223
Interest cost 83 75 166 151
Expected return on plan assets (75) (78) (149) (157)
Amortization of net loss 21 21 42 43
Net periodic benefit cost $ 132 $ 130 $ 264 $ 260