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Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plan [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 102 $ 111 $ 307 $ 334
Interest cost 83 76 249 227
Expected return on plan assets (74) (79) (223) (236)
Amortization of net loss 21 22 63 65
Net periodic benefit cost $ 132 $ 130 $ 396 $ 390