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Pension Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]        
Service cost $ 42 $ 88 $ 152 $ 142
Interest cost 370 361 1,099 1,077
Expected return on plan assets (470) (456) (1,369) (1,386)
Recognized net actuarial loss 146 158 392 436
Net periodic benefit cost $ 88 $ 151 $ 274 $ 269